I configure the same user account in Outlook 2007 with RPC OVER HTTP at 2 diffrent places: Place 1#: The connexion is fine when I check connexion on connection status from Outlook. Place 2#: The connexion seems not stable because some time Outlook says: Trying to connect to MS Exchange and it stays like that for around 5 min When I check on connection status from Outlook it says: connecting for all servers. I thought maybe the prob is just on the pc but on another pc it twas the same thing. Now I start to think its a internet connection issue. Is there something I can do to prouve it?

Hi,You can try to ctrl rightclick the Outlook icon and try the connection status and the automatic configuration of e-mail.These should tell you something.Leif

Ya that what I tried but is there something else beside that?

Please test with same machine, does the machine always stable on one place and unstable on the other place Does the same symptom happen to all machines which work well on other places before?

Please test with same machine, does the machine always stable on one place and unstable on the other place:Yes test the same acount at Place1 and it was always stable. The tests done at Place2 with different machines, 2 different profiles and it was always unstable. Does the same symptom happen to all machines which work well on other places before?:It never works fine cuz it's a new client so I realized whatever pc I configure at that place the symtoms is the same even if firewall, antivirus are disabled. But I test their internet by pinging yahoo (my RPC Server doesn't respond to ping) 100 times: no packket loss...It seems there is something in their connection which cause the prob withRPC connection.Thanks

Yes, the most possible cause is the network at that location You can use Network Monitor to capture the traces when the symptom reproduced, and look for the relevant error info How to capture network traffic with Network Monitor