Hello all...
we have a very strange behaviour in IE10 when surfing to https website blocked by the
category filter in the webproxy (URL filtering only option enabled for https).
The expected behavior would be that the block page is showed. This works in all other
browsers just fine - except in IE10.
Here we have the error message "der proxyserver reagiert nicht" / "The proxyserver is not responding". In some cases if the same user visits the blocked url again the blockpage is showed as expected!
I have changed all different settings in the UTM and also in IE without any change to this behavior. Sophos has also investigated the issue and their only commentz ist that this is an IE10 specific error and not their responsibility. We should upgrade to IE11 or use another browser.
But this error occurs at one of our customers sites where we do a prove of concept for 300+ users at the moment so this is not really an option.
Any thougts / ideas why this penomenon occures and possible solutions would be much appreciated...
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