Murphy's Law, every time I do a forum post about some issue I am having I find the solution like 5 minutes later. I can confirm this is a bug, the issue is with the web proxy in Sophos XG. The fix is to console into the firewall and run the following command set http_proxy relay_invalid_http_traffic on That will basically tell the firewall to just forward the traffic it can't recognize anyway, obviously this should have to be done, it seems to be marking genuine requests as invalid ones, but considering I am not in an enterprise environment I can live with the "invalid" traffic until it's fixed. Just googling Sophos XG 502 comes up with a bunch of other forum posts about this dating back to February Going to post this anyway in case others are facing the 502 Gateway error with their Sophos Box
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