The exception page is given because the ProxySG must report back that a problem occurred. In this "example case" the outbound port 80 (http) was blocked on the firewall but, however depending on the customers environment there may be other issues.
First find out why the ProxySG is returning the "TCP ERROR" page. This can be done by getting a PCAP on the ProxySG to see the request.
If you see the above example then you need to move on to the upstream devices like Firewalls / Gateways and get packet captures from these to see if these are getting a response and not sending it back to the ProxySG
Imported Document ID: 000016966
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