What is ICAP Protocol Error?

Danger

Please ensure your license key is not expired. If it is expired, Web Safety cannot start and ICAP connections from Squid will fail.

When something is wrong with ICAP communication channel between Squid and wsicapd web filtering daemon, users may see the ICAP error page that looks like this.

This means Squid was not able to contact the wsicapd web filtering ICAP daemon running at port 1344 and thus stopped the HTTP/HTTPS transaction. There are two possible reasons for ICAP error like this - either daemon has crashed or Squid cannot connect to the daemon due to incorrect configuration or internal limitations.