I have nginx proxying imap and pop between 3 different backend servers, but it seems to be limited to about 210 concurrent connections. Requests beyond this get a connection timed out. I tried adding more worker processes but that didn't do anything. I have multi_accept on and have raised the number of worker_connections, but still no luck. I see rate limiting and connection bandwidth limiting, but these appear to apply to the http protocol and not the imap/pop protocol. What parameters to I adjust to increase the number of concurrent sessions to imap/pop?
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