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Error 64 Yahoo Mail - 9.Apr.2008 4:25:32 PM

pprue

Posts: 3
Joined: 27.Mar.2008
Status: offline

We have a pair of Ms ISA 2006 Enterprise Servers running to provide access to Active Sync , OWA etc.

From the inside of the network these are also acting as a web proxy for a number of internal users.
The default route of the network is out one of 2 pairs of Cisco Pix Firewalls . They require authentication and by using the ISA we capture the authentication transparent to the user.

We had been running over a burdened internet connection and everything was working fine.. slow but fine.

We added another larger internet connection from a microwave provider and after pointing the default route of the ISA cluster across the microwave connection we are getting error 64s on pages such as yahoo mail , hotmail , ebay . Typically when they are doing the redirections etc .

Ie you can log into yahoo mail click on a message and get it but then click on check mail or inbox and bang .. ISA error.

I have enabled PMTUDiscovery thinking it might be an MTU issue possibly but no changes.

Other ideas?