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How to fix Exchange & Outlook connection issues over IPSec VPN
Posted on Feb 22, 2008 under Windows, juniper, vpn | 1 CommentTags:encryption exchange fragmentation ipsec juniper MSS mtu outlook screenos vpn
Recently we had this problem with this problem with an Exchange 2003 server in the HQ and Outlook Clients in a particular branch office. The Branch office connects into the HQ through a site to site IPSec VPN using Juniper Netscreen SSG20 firewalls on either end of tunnels.
The Problem
The Outlook clients would connect OK but suddenly loose connection to the Exchange server and never connect back. The Outlook Client status will say "Disconnected". The client PCs will however be able to ping the server and network connections look OK. This happened in random times and sometimes when sending large emails.
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