ISA 2004 - Site to Site - HTTP Error 500
From: Tony (*!SPAM-NO!*pctony_at_gmail.com)
Date: 01/25/05
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Date: Tue, 25 Jan 2005 02:29:37 -0800
Hi Guys,
Just a quickie:
I am using my ISA server for a VPN Endpoint for a Site to Site VPN
connection. All traffic travereses this connect fine except HTTP.
I have added the network rule (route mode), and also added a access rule
allowing unresticted access in both directions as this is a remote
office site.
As I said everything works very sweetly across the tunnel with the
exception of http, let me explain some more:
A user accesses an IIS server in the remote site, using either DNS or IP
address, and eventually error 500 is the result. If i disable friendly
error messages in IE the result is :
Error Code: 500 Internal Server Error. The host server is unreachable.
(10065)
I know the server is working fine as can be browsed from anywhere else
(internally and externally) just not across the ISA tunnel.
I then started the the logging and modified the filter, and saw what was
happening. The request was going through the ISA server, and then it
appears to be proxying the request.
You would see the initial connection attempt, then the ISA server was
initiate the connection to the server "on my behalf". The the
connection would fail and the next event in the log is "Failed
connection attempt"
What I guess I want to know is :
1. Is this standard 'behaviour' in 2004?
2. Why is the problem only affecting HTTP?
3. What can I do to either disable it or circumvent the 'apparent
proxying' for internal subnets?
Cheers
Tony
MCSE+I
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