On Sat, 2010-04-24 at 11:59 -0500, Stan Hoeppner wrote: > Hanspeter Kunz put forth on 4/24/2010 9:17 AM: > > > yes, that is what I suspected too first. Indeed, I had to increase the > > max_userip_connections limit in the past. Since then, our dovecot server > > works fine with all clients (Evolution, TBird, Applemail, ...), except > > for roundcube. And there is no indication in the logs that the > > max_userip_connections limit is hit. > > This may not be an imap concurrency limit being hit but an auth process > limit. The two are configured separately and auth has many more knobs.
ah, good point. I increased auth_worker_max_count to 64 and this seems to have solved the problem. Thanks! > Regardless, installing an imap proxy will very likely solve your problem > painlessly and with little effort. yes, yes, you've already convinced me, I *will* install imapproxy, I promise :) I first wanted to solve the problem and then to improve the system ;) Many thanks to all of you, Hp > Please do install and properly configure an imap proxy on your RC server. > It's very lightweight. You don't need a separate box for it. This Debian > aptitude description pretty much spells out why (most) webmail servers need > an imap proxy. > > Description: IMAP protocol proxy > UP-ImapProxy proxies IMAP transactions between an IMAP client and an IMAP > server. The general idea is that the client should never > know that it is not talking to the real IMAP server, but ImapProxy caches > server connections. > > ImapProxy was written to compensate for webmail clients that are unable to > maintain persistent connections to an IMAP server. Most > webmail clients need to log in to an IMAP server for nearly every single > transaction; This behaviour can cause tragic performance > problems on the IMAP server. ImapProxy tries to deal with this problem by > leaving server connections open for a short time after a > webmail client logs out. When the webmail client connects again, ImapProxy > will determine if there is a cached connection available > and reuse it if possible. > Homepage: http://www.imapproxy.org > _______________________________________________ List info: http://lists.roundcube.net/users/
