Question: What port does Memcached use?

Answer

By default, Memcached uses port 11211 for both TCP and UDP protocols. This can be changed by modifying the Memcached configuration file and specifying a different port number.

Here's an example of how to start a Memcached instance on port 11212 using the memcached command-line tool:

memcached -p 11212

To verify that Memcached is listening on the correct port, you can use the netstat command:

netstat -tln | grep 11212

This should display a line similar to the following if Memcached is running and listening on port 11212:

tcp        0      0 0.0.0.0:11212           0.0.0.0:*               LISTEN

It's worth noting that some hosting providers may block certain ports for security reasons, so it's always a good idea to check with your hosting provider if you're having trouble connecting to Memcached.