I used to have same error but unfortunately it can be anything imho, error 502 seems to appear in any case or most of them.
For my setup when i used to get those messages, it was due to vacations and mail forward enabled while sieve was not installed on the remote mail server.
Have a look in the logs of sogo and /var/log/mail/error, it maybe could help ?

Regards

Pierre Todorovic

Daniel Müller a écrit :
Dear all,
after upgrading today to sogo sogo-1.2_20100606-1 on Centos 5.3.
There is an error when I want to see emails in my courier-imap inbox, drafts,sent,trash. The shared folders still work well.
The error in web-gui:
Error 502

The proxy server received an invalid response from an upstream server.

For all text see attachement.
  




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