Rules with computer object created in Visual Policy Manager/Local Policy did not match right after an upgrade to SGOS 126.96.36.199 or above.
Proxy uses Reverse DNS lookup to lookup for Computernames from IP.
However by default Reverse DNS lookup is disabled starting SGOS 188.8.131.52 or above to enhance security.
See article TECH246181 for more information.
Refer to solution in TECH246181 to turn on Reverse DNS Lookup