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I've got a client whose QuickBooks updates fail on an XG125 with XG OS 17.0.3 MR-3 unless we disable http scanning and IDS on the firewall rule. The firewall and web filter do not log any denies. I've also seen some odd behavior with streaming installs of Office 365 and Dropbox on this same firewall.
I had a similar problem. I added the following under Web->Exceptions as a URL Pattern Matching exception: