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Unable to esatblish the VPN Connection

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tek1ket

MIS
Jan 25, 2009
70
IR
Users in our network should make a VPN Connection to ISA server to connect to Internet, they can do it well and without any problem, but sometimes (very rarely) a few of users get this error messaage
"Error 800: Unable to establish VPN Connection. The VPN Server may be Unreachable, or security parameters may not be configured properly for this connection".
when a User named UserX get this error ( who was working with it,till previous hour with that connection) the rest of users are working fine and without problem.
ISA server is reachbale (as the rest of users are working) and from UserX the ping time for ISA server is ok.
the configuration for the VPN are correct, and nothing is changed in ISA server.
I would check the ISA server log file and RAS Log file, it seems no request has beem reached to ISA server from UserX, on the other hand ,it seems no request has been gone out from UserX PC to ISA.

So I have to delete that VPN Connection and create a new one the excat the same configuration, and it works.

how can i trace the error?
 
is there a limited number of tunnels? is there enough dhcp addresses?
 
Yes , I have more than enough tunnel and dhcp address
 
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