Mac behind a pf firewall

[Axel Rau]

Am 04.02.2008 um 19:44 schrieb Christian Edward Gruber:

> That's my setup and I have no problems with this.
>
> Mail.app -----> OpenBSD 4.1 pf -----> courier-imap mailserver
Similar setup with me. It happened with courier-imap and now with  
archiveopteryx.
>
>
> Does restarting your Mail.app end up working?
Yes, mostly. It happens, if you have some long lasting IMAP activity,  
like scanning big mailbox trees or copying hundreds of mails.

In the activity monitor of Mail, those links show up as stalled.

Could you try to reproduce it?

tcpdump shows that Mail issues a TCP FIN but receives some more data  
messages before the FIN from the server. This is legal but seems not  
to be liked by
Mail, so it issues a RST. This reset has the wrong sequence number and  
ist refused by the firewall.
The TCP stack problem is bug #5008062 (2007-02-19).

I can't believe that I'm the only site with Apple IMAP clients behind  
a pf firewall, seeing this problem.

By the way, with thunderbird I don't see these RSTs.

Axel
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Axel Rau, ☀Frankfurt , Germany                       +49 69 9514 18 0