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Exchange 2013 CU11 502 Proxy Error

Hello everyone,

i like to publish my Exchange 2013 through Sophos WAF in my lab because of some testing scenarios. I've already followed these guide ( https://sophserv.sophos.com/repo_kb/120454/file/Exchange%20WAF%20Guide%20-%20UTM%209.3%20-%20Nov%202015.pdf) and also tried some troubleshooting, but i still got the following error:

"502 Proxy Error"

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /owa.

Reason: Error reading from remote server

Has anyone an idea what could cause this error?

OWA and ActiveSync are working fine from internal networks.

Thank you very much in advance and best regards
Simon

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