How to stop app rstudio loading on localhost:8787

Doug Fir

(Tag recommendations welcome, I do not know how to properly categorise or tag my issue)

Ubuntu 18.04.

I have a mystery. When I visit localhost:8787 I am taken to the rstudio login screen:

enter image description here

I do not know what process is hosting the rstudio app at localhost:8787. A few weeks back I DID run a docker container for rstudio that was accessed via localhost:8787. However, that container has been stopped, deleted and in fact, I have deleted all docker images:

(No containers here)

docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

Not even any images to run:

docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

I found a post after a search for 'how to tell what process is hosted on localhost'. I was not sure of what search term to use here.

Following some searching I ran this command in the terminal:

netstat -aon | grep 8787

Which returned this:

netstat -aon | grep 8787
tcp        0      0 0.0.0.0:8787            0.0.0.0:*               LISTEN      off (0.00/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41490         TIME_WAIT   timewait (47.91/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41212         TIME_WAIT   timewait (16.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41402         TIME_WAIT   timewait (39.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41344         TIME_WAIT   timewait (32.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41144         TIME_WAIT   timewait (7.76/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41340         TIME_WAIT   timewait (31.84/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41090         TIME_WAIT   timewait (0.76/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41096         TIME_WAIT   timewait (1.74/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41200         TIME_WAIT   timewait (14.80/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41556         TIME_WAIT   timewait (56.61/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41080         TIME_WAIT   timewait (0.00/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41356         TIME_WAIT   timewait (33.85/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41240         TIME_WAIT   timewait (19.80/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41492         TIME_WAIT   timewait (48.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41294         TIME_WAIT   timewait (26.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41078         TIME_WAIT   timewait (0.00/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41324         TIME_WAIT   timewait (29.83/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41286         TIME_WAIT   timewait (25.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41436         TIME_WAIT   timewait (41.86/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41388         TIME_WAIT   timewait (37.86/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41282         TIME_WAIT   timewait (24.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41306         TIME_WAIT   timewait (27.83/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41198         TIME_WAIT   timewait (14.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41564         TIME_WAIT   timewait (57.61/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41170         TIME_WAIT   timewait (10.79/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41548         TIME_WAIT   timewait (55.61/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41520         TIME_WAIT   timewait (51.92/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41216         TIME_WAIT   timewait (16.80/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41348         TIME_WAIT   timewait (32.89/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41394         TIME_WAIT   timewait (38.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41118         TIME_WAIT   timewait (4.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41226         TIME_WAIT   timewait (17.81/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41298         TIME_WAIT   timewait (26.83/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41130         TIME_WAIT   timewait (5.81/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41544         TIME_WAIT   timewait (54.92/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41498         TIME_WAIT   timewait (48.91/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41450         TIME_WAIT   timewait (43.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41562         TIME_WAIT   timewait (56.95/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41202         TIME_WAIT   timewait (14.80/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41092         TIME_WAIT   timewait (1.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41106         TIME_WAIT   timewait (2.76/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41196         TIME_WAIT   timewait (14.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41352         TIME_WAIT   timewait (33.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41574         TIME_WAIT   timewait (58.62/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41554         TIME_WAIT   timewait (55.93/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41272         TIME_WAIT   timewait (23.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41338         TIME_WAIT   timewait (31.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41560         TIME_WAIT   timewait (56.94/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41390         TIME_WAIT   timewait (37.93/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41452         TIME_WAIT   timewait (43.86/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41346         TIME_WAIT   timewait (32.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41570         TIME_WAIT   timewait (57.96/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41254         TIME_WAIT   timewait (21.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41486         TIME_WAIT   timewait (47.61/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41350         TIME_WAIT   timewait (32.92/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41382         TIME_WAIT   timewait (36.87/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41110         TIME_WAIT   timewait (3.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41374         TIME_WAIT   timewait (35.87/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41274         TIME_WAIT   timewait (23.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41270         TIME_WAIT   timewait (23.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41172         TIME_WAIT   timewait (11.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41244         TIME_WAIT   timewait (20.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41482         TIME_WAIT   timewait (46.89/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41370         TIME_WAIT   timewait (35.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41208         TIME_WAIT   timewait (15.79/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41578         TIME_WAIT   timewait (58.96/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41292         TIME_WAIT   timewait (25.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41114         TIME_WAIT   timewait (3.77/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41156         TIME_WAIT   timewait (9.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41460         TIME_WAIT   timewait (44.89/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41168         TIME_WAIT   timewait (10.78/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41310         TIME_WAIT   timewait (28.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41440         TIME_WAIT   timewait (42.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41160         TIME_WAIT   timewait (9.78/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41552         TIME_WAIT   timewait (55.92/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41584         TIME_WAIT   timewait (59.94/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41234         TIME_WAIT   timewait (18.81/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41132         TIME_WAIT   timewait (6.55/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41366         TIME_WAIT   timewait (34.86/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41458         TIME_WAIT   timewait (44.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41456         TIME_WAIT   timewait (44.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41404         TIME_WAIT   timewait (39.86/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41084         TIME_WAIT   timewait (0.54/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41386         TIME_WAIT   timewait (37.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41210         TIME_WAIT   timewait (15.80/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41098         TIME_WAIT   timewait (1.74/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41134         TIME_WAIT   timewait (6.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41320         TIME_WAIT   timewait (29.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41514         TIME_WAIT   timewait (50.92/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41312         TIME_WAIT   timewait (28.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41120         TIME_WAIT   timewait (4.76/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41082         TIME_WAIT   timewait (0.00/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41568         TIME_WAIT   timewait (57.94/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41462         TIME_WAIT   timewait (44.89/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41566         TIME_WAIT   timewait (57.62/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41360         TIME_WAIT   timewait (34.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41104         TIME_WAIT   timewait (2.75/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41536         TIME_WAIT   timewait (53.92/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41586         TIME_WAIT   timewait (59.96/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41326         TIME_WAIT   timewait (29.83/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41276         TIME_WAIT   timewait (24.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41378         TIME_WAIT   timewait (36.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41540         TIME_WAIT   timewait (54.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41330         TIME_WAIT   timewait (30.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41392         TIME_WAIT   timewait (38.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41384         TIME_WAIT   timewait (37.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41488         TIME_WAIT   timewait (47.89/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41162         TIME_WAIT   timewait (9.79/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41238         TIME_WAIT   timewait (19.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41504         TIME_WAIT   timewait (49.90/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41194         TIME_WAIT   timewait (13.79/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41300         TIME_WAIT   timewait (26.83/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41242         TIME_WAIT   timewait (19.80/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41476         TIME_WAIT   timewait (46.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41572         TIME_WAIT   timewait (58.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41204         TIME_WAIT   timewait (15.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41538         TIME_WAIT   timewait (53.92/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41176         TIME_WAIT   timewait (11.78/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41108         TIME_WAIT   timewait (3.55/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41150         TIME_WAIT   timewait (8.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41480         TIME_WAIT   timewait (46.89/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41420         TIME_WAIT   timewait (40.87/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41532         TIME_WAIT   timewait (53.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41534         TIME_WAIT   timewait (53.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41232         TIME_WAIT   timewait (18.80/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41088         TIME_WAIT   timewait (0.74/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41576         TIME_WAIT   timewait (58.94/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41252         TIME_WAIT   timewait (21.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41124         TIME_WAIT   timewait (5.55/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41398         TIME_WAIT   timewait (38.87/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41526         TIME_WAIT   timewait (52.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41308         TIME_WAIT   timewait (27.83/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41468         TIME_WAIT   timewait (45.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41220         TIME_WAIT   timewait (17.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41102         TIME_WAIT   timewait (2.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41246         TIME_WAIT   timewait (20.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41296         TIME_WAIT   timewait (26.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41542         TIME_WAIT   timewait (54.62/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41218         TIME_WAIT   timewait (16.80/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41508         TIME_WAIT   timewait (50.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41412         TIME_WAIT   timewait (40.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41258         TIME_WAIT   timewait (21.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41336         TIME_WAIT   timewait (31.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41328         TIME_WAIT   timewait (30.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41512         TIME_WAIT   timewait (50.91/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41380         TIME_WAIT   timewait (36.85/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41364         TIME_WAIT   timewait (34.85/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41288         TIME_WAIT   timewait (25.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41256         TIME_WAIT   timewait (21.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41582         TIME_WAIT   timewait (59.62/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41186         TIME_WAIT   timewait (12.79/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41400         TIME_WAIT   timewait (39.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41302         TIME_WAIT   timewait (27.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41368         TIME_WAIT   timewait (35.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41550         TIME_WAIT   timewait (55.61/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41182         TIME_WAIT   timewait (12.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41158         TIME_WAIT   timewait (9.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41484         TIME_WAIT   timewait (47.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41112         TIME_WAIT   timewait (3.76/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41332         TIME_WAIT   timewait (30.83/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41580         TIME_WAIT   timewait (59.61/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41410         TIME_WAIT   timewait (40.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41524         TIME_WAIT   timewait (52.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41206         TIME_WAIT   timewait (15.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41224         TIME_WAIT   timewait (17.80/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41248         TIME_WAIT   timewait (20.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41448         TIME_WAIT   timewait (43.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41154         TIME_WAIT   timewait (8.78/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41362         TIME_WAIT   timewait (34.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41354         TIME_WAIT   timewait (33.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41230         TIME_WAIT   timewait (18.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41076         TIME_WAIT   timewait (0.00/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41116         TIME_WAIT   timewait (4.55/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41496         TIME_WAIT   timewait (48.90/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41188         TIME_WAIT   timewait (13.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41164         TIME_WAIT   timewait (10.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41446         TIME_WAIT   timewait (42.88/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41236         TIME_WAIT   timewait (19.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41438         TIME_WAIT   timewait (41.86/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41322         TIME_WAIT   timewait (29.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41260         TIME_WAIT   timewait (22.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41268         TIME_WAIT   timewait (23.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41516         TIME_WAIT   timewait (51.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41304         TIME_WAIT   timewait (27.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41192         TIME_WAIT   timewait (13.78/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41406         TIME_WAIT   timewait (39.87/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41316         TIME_WAIT   timewait (28.84/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41278         TIME_WAIT   timewait (24.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41472         TIME_WAIT   timewait (45.89/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41126         TIME_WAIT   timewait (5.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41432         TIME_WAIT   timewait (41.59/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41136         TIME_WAIT   timewait (6.76/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41358         TIME_WAIT   timewait (33.85/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41342         TIME_WAIT   timewait (31.86/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41140         TIME_WAIT   timewait (7.55/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41264         TIME_WAIT   timewait (22.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41222         TIME_WAIT   timewait (17.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41262         TIME_WAIT   timewait (22.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41470         TIME_WAIT   timewait (45.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41454         TIME_WAIT   timewait (43.87/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41152         TIME_WAIT   timewait (8.77/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41558         TIME_WAIT   timewait (56.62/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41138         TIME_WAIT   timewait (6.78/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41122         TIME_WAIT   timewait (4.77/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41334         TIME_WAIT   timewait (30.84/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41142         TIME_WAIT   timewait (7.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41510         TIME_WAIT   timewait (50.61/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41478         TIME_WAIT   timewait (46.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41502         TIME_WAIT   timewait (49.61/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41266         TIME_WAIT   timewait (22.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41314         TIME_WAIT   timewait (28.83/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41522         TIME_WAIT   timewait (51.93/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41178         TIME_WAIT   timewait (11.79/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41146         TIME_WAIT   timewait (7.78/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41434         TIME_WAIT   timewait (41.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41280         TIME_WAIT   timewait (24.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41128         TIME_WAIT   timewait (5.80/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41474         TIME_WAIT   timewait (45.89/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41376         TIME_WAIT   timewait (36.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41228         TIME_WAIT   timewait (18.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41418         TIME_WAIT   timewait (40.87/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41442         TIME_WAIT   timewait (42.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41190         TIME_WAIT   timewait (13.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41530         TIME_WAIT   timewait (52.92/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41250         TIME_WAIT   timewait (20.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41396         TIME_WAIT   timewait (38.86/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41372         TIME_WAIT   timewait (35.87/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41546         TIME_WAIT   timewait (54.93/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41528         TIME_WAIT   timewait (52.91/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41500         TIME_WAIT   timewait (49.60/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41180         TIME_WAIT   timewait (12.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41184         TIME_WAIT   timewait (12.78/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41506         TIME_WAIT   timewait (49.91/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41166         TIME_WAIT   timewait (10.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41518         TIME_WAIT   timewait (51.61/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41494         TIME_WAIT   timewait (48.61/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41214         TIME_WAIT   timewait (16.58/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41094         TIME_WAIT   timewait (1.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41086         TIME_WAIT   timewait (0.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41148         TIME_WAIT   timewait (8.56/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41290         TIME_WAIT   timewait (25.82/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41174         TIME_WAIT   timewait (11.57/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41100         TIME_WAIT   timewait (2.55/0/0)
tcp        0      0 127.0.0.1:8787          127.0.0.1:41444         TIME_WAIT   timewait (42.87/0/0)

What's happening here?! Why is localhost:8787 serving rstudio app and how can I stop it?

EDIT: Output from dpkg -l | grep rstudio and systemctl list-units --type service | grep -i rstudio below per comments:

dpkg -l | grep rstudio
ii  rstudio                                    1.3.1093                                         amd64        RStudio
ii  rstudio-server                             1.3.1093                                         amd64        RStudio Server

and

systemctl list-units --type service | grep -i rstudio
rstudio-server.service                                loaded active running RStudio Server    
N0rbert

If you want to disable RStudio Server temporarily, then disable its service by

sudo systemctl disable rstudio-server.service

If you want to remove RStudio Server completely, then uninstall it with

sudo apt-get purge rstudio-server

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