Problem with IM join invitation

When I try to start an IM with someone, he can see my invitation and my browser start with the meeting, but when he click join, nothing start.

I have 500 notes in my organization and many of these have this behavior.

What can i try?

Subject: Problem with IM join invitation - Solved

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http://www-1.ibm.com/support/docview.wss?rs=899&uid=swg21176141