I've seen plenty of posts on DL (distribution list) expansion...but i cannot seem to get our implementation working! Funny thing is, I had it working at one time...prior to setting up external access...now it doesnt work! It just returns the error message mentioned in the subject of this thread.
"Communicator cannot connect to the server becasue the required security is not in place on the server. Contact your system admin...."
Anything helps! Please advise.