Proxy problem: "imap-login: Error: proxy(USERNAME): connect(10.x.x.178, 993) failed: Cannot assign requested address (after 0 secs, local=10.x.x.104)"

[Ralf Hildebrandt]

* brd <barraudu at tiscali.it>:
> Ralf Hildebrandt wrote:
> [...]
> > We already optimized:
> > ---- snip ----
> > net.ipv4.tcp_fin_timeout=5
> > # down from 30s
> > net.ipv4.tcp_tw_reuse=1
> > net.ipv4.tcp_tw_recycle=1
> > # http://redis4you.com/articles.php?id=012&name=Redis+high+traffic+connection+issue
> 
> just a note on enabling tcp_tw_recycle, it is known to have side-effects
> and issues when you have lots of connections from the same source IP, such
> as many clients behind same NAT IP or a reverse proxy
> 
> see http://vincent.bernat.im/en/blog/2014-tcp-time-wait-state-linux.html

Yes, we might want to disable that again.

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