In firewalls running 3.1.7, I was able to use a custom URL category to create an exception for the domain *.citrixonline.com. I think Citrix Online domains/IPs are the main culprit when SSL decrypt breaks GoToMeeting or another Citrix product. My opinion: When implementing SSL Decryption, create rules that allow for exceptions for both sources and destinations, and the use of a custom URL category is super helpful as well.
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