ISA 2004 Site Vpn Re-Connection Problem

Hi There,

I've got an Main office and a Site office.  Both are running Windows Server 2003 R2 and ISA 2004.  We've got a Demand Dial vpn site connect between the two sites.  My problem is the site office will go down once every so many hours and will never reconnect.  I'll reboot the site office isa server, and when it comes up, the connection will reconnect without a problem.  I think it has something to do with once the isa box gets disconnected it doesn't close the port or something like that.  Also, if the main office try's to reconnect after the site goes down, the main office connection will connect as a 'Remote Access Connection'  not a 'Network Interface' connection.

The error message I'm getting when we try to reconnect is:

An error occured during connection of the interface.
The modem (or other connecting device) has reported an error.

Any help would be great.

Thanks,

Steven.
mattamyhomesAsked:
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Keith AlabasterConnect With a Mentor Enterprise ArchitectCommented:
What are the routers that are connecting the two sites together?
You say its a demand-dial, is this an ISDN-based connection between the sites? Are you charged by the amount of time the line is up?

In the ISA gui - monitoring - connection verifiers, you can place ntries here that 'check' the connectivity of a device/service periodically. If you were to check a device/service that was at the other end of the VPN, this would ensure that the line stayed up. On the assumption that you have configured the firewall policy rules to only allow 'required' or 'interesting' traffic to pass across the vpn then you will not be passing tons of traffic. You can do the same at both ends or just one if you wish.

Also, open the isa gui, select monitoring - logging - click on start query.
this is a realtime logging monitor. What do you see at the time you get the error message?

Yet again in the monitoring tab, select alerts. Any listed? Drill down the alerts and a more detailed message is displayed at the bottom of the screen.

Have you installed ALL of the ISA service packs, roll up patches and MS updates?
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Keith AlabasterEnterprise ArchitectCommented:
Did you need any further prompts/suggestions?
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