Public bug reported: I have recently upgraded a working email server from ubuntu 11.10 to 12.04 final beta, and the following issue is occuring.
After running fine for a random period of time (anywhere from 10 mins to 40 hours), courier-imap will stop accepting connections, and email clients are no longer able to check mail. After the error occurs, thunderbird for example fails with an error of the form: "Server [email protected] has disconnected. The server may have gone down or there may be a network problem" Other email clients fail with similar errors. There are no clues in either syslog, mail.log, mail.error etc. Restarting the courier-imap and courier-imap-ssl services does not solve the issue. However, if the server is rebooted, then the imap services come up and work fine. The bug is difficult to reproduce, but definitely occurs in the normal scheme of things at least once every 40 hours. Having said that, I have managed to exercise the bug consistently by using a web client such as squirrelmail to access emails via imap. The bug can also sometimes be reproduced by accessing the same mailbox simultaneously using two email clients (eg desktop mail client + smartphone mail client at the same time). So this may be some sort of locking or timing bug. There is at least one other user who has experienced this problem, we have had a discussion on the ubuntu forums here: http://ubuntuforums.org/showthread.php?s=fba71f803c489876a75fb08df822a930&p=11856138 I recommend a high priority for this problem, as I believe a lot of email servers based on ubuntu will become unusable on upgrade to 12.04 if this problem is not corrected. Please let me know if there is any other data I can collect to help solve this problem. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: courier-imap 4.9.1-1ubuntu4 ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14 Uname: Linux 3.2.0-23-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.0.1-0ubuntu5 Architecture: amd64 Date: Tue Apr 24 21:10:53 2012 SourcePackage: courier UpgradeStatus: Upgraded to precise on 2012-04-12 (11 days ago) ** Affects: courier (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug courier-imap imap precise -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/987823 Title: courier-imap stops accepting connections To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/courier/+bug/987823/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
