I wanted to give the community a little tip about something I ran into last week.
Multiple users reported sporadic ICAP errors when trying to open pdfs online. The website would time out and then we would get a generic Barracuda error page describing an ICAP error without an error number. After working with Barracuda Tech support for some time, we figured out that the Advanced malware Protection on the MX84 and the Barracuda WSG were not playing nice together. I turned off the AMP (basically overkill anyway) and all is working fine now.