502 gateway error

Hi,
I've come across a problem and not sure where the problem lies, hope
someone can help me. When I access webmail through portal gateway
(Portal 3SP2 on Solaris 8 (webmail from iMS 5.1), and attach big
attachments (>400kb through dial up, over 2MB through DSL), I eventually
receive this message while my attachment is uploading:
Unable to fulfill your request
Server returned 502 Gateway Error: Session: Unable to connect to host:
hostname of portal+profile server.
The timeout periods differ, which makes it hard in pinpointing the
error. For example, using DSL, uploading a 2.25 MB attachment, I got
the error after 7 minutes of uploading, while I received it after 4
minutes on a modem line. I have no issues uploading small attachments.
The portal server (not gateway) also has the messaging server residing
on it, no messages in the error log of the messaging server.
thanks in advance,
Manon

Generally 502 Gateway error occurs when the URL in the address bar is not reachable by the Gateway. Maybe the URL is not the correct one or some rewrite related issues. The best way to debug is to bypass the gateway and check if the URL works fine from all the servers (in http mode). Another workaround is, try pinging that particular domain from Gateway Host.
If you still find the error, Turn the debug=message in /etc/opt/SUNWips/platform.conf and try to reach the same URL 2 or 3 times. Then send me the /var/opt/SUNWips/debug/iwtGateway file.

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