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PHP - memcache randomly fails with - Cannot assign requested address (99)

Martin Perry Published at Dev
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Martin Perry

I have changed my caching system (it is using more caching) and switched to PHP 7.1. Now from time to time (approx. 1 run out of 5) I got this error with memcache:

Notice: Memcache::connect(): Server 127.0.0.1 (tcp 11211, udp 0) failed with: Cannot assign requested address (99) 

Warning: Memcache::connect(): Can't connect to 127.0.0.1:11211, Cannot assign requested address (99)

What is causing this and why only sometimes? So far I have no problem witch this and on localhost, all is running OK as well.

Bryan

The error can mean that you have opened and closed connections so quickly that TCP has no more available ports to create the next connection.

See if your memcached client has a setting to "pool" connections so they stay open.

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