In testing Group Chat with an XP workstation for a customer, I found I could not upload a file successfully. The truth is that I haven’t been able to do this for a while but ignored it. I could not ignore it this time as I had to confirm as much functionality as possible. I did a quick search internally and externally and found Doug’s post - http://blogs.technet.com/b/dodeitte/archive/2009/10/07/issues-with-group-chat-file-upload.aspx

Turns out that I had to add the certificate as he did in step 1 but I had a variation of his 3rd error but still with permissions -

 

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The solution was to modify the permissions on the share as follows:

File Share: \\ContosoR2GC\GrpChatWebServ

Everyone:Read
GroupChatChannelServiceUser: Full Control


TomL LCSKid