First imap connection after a new established network connection fails with "Failed to connect to server"

[Matthias G.]

Binary package hint: thunderbird

The dialog "Failed to connect to server xy" appears although there is a working network connection.

Steps to reproduce:
1. Close Thunderbird
2. Disconnect your network connection (in my case it is wireless)
3. Open Thunderbird
4. Expected dialogs "Failed to connect to server xy" - since there is no network connection.
5. Click all the dialogs away with ok.
6. Connect your network.
7. Open your favorite website in e.g. Firefox - just to make sure the network connection works.
8. Click "Get Mail" in Thunderbird.
9. UNEXPECTED dialog "Failed to connect to server xy" appears!
10. Click it away.
11. Clicking "Get Mail" again now just works fine.

All the accounts are configured with IMAP via SSL. Gmail and other providers.

$ lsb_release -rd
Description: Ubuntu 10.04 LTS
Release: 10.04

$ apt-cache policy thunderbird
thunderbird:
  Installed: 3.0.4+nobinonly-0ubuntu4
  Candidate: 3.0.4+nobinonly-0ubuntu4
  Version table:
 *** 3.0.4+nobinonly-0ubuntu4 0
        500 http://ubuntu.inode.at/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

Architecture: amd64

[Matthias G. (matgnt)]

It doesn't help to disable the "offline status detection via NetworkManager" in the config editor (toolkit.networkmanager.disable).

[Human (bob-igo)]

This happens under additional circumstances. In my case, a wired connection, and after Suspend, but also with all (two) accounts IMAP and SSL. My variant steps to reproduce:

1. Run Thunderbird.
2. Verify that "Get Mail" works normally in Thunderbird.
3. Suspend the computer.
4. Awaken the computer.
5. Wait for network to re-establish itself.
6. Click "Get Mail" in Thunderbird.
7. UNEXPECTED dialog "Failed to connect to server xy" appears!
8. Click it away.
9. Clicking "Get Mail" again now just works fine.

$ lsb_release -rd
Description: Ubuntu 10.04 LTS
Release: 10.04

$ apt-cache policy thunderbird
thunderbird:
  Installed: 3.0.4+nobinonly-0ubuntu4
  Candidate: 3.0.4+nobinonly-0ubuntu4
  Version table:
 *** 3.0.4+nobinonly-0ubuntu4 0
        500 http://mirrors.rit.edu/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

Architecture: i686

[Matthias G. (matgnt)]

I can confirm that the problem also occurs after a suspend as Human describes.