(Mind you I don't run a Sonicwall but picked this up from the listserves)
So someone was having problems where the calendar invites wouldn't work. Would work for some of their clients but not others…. the reason?
The Sonicwall sees those calendar invites as a threat and blocks them. I'm assuming that somewhere in the documenation it tells you this…but since I've seen a couple of folks get stuck on this I'm blogging the response from the folks that use Sonicwall to make it a smidge easier for folks to find:
In the Intrusion Protection Service (part of the comprehensive security suite), uncheck the IPS box that checks for meeting requests.