On ISA , allow the URL site or domain sets that ISA may block it
http://www.isaserver.org/a
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I have a certain external website that resolves by my DNS but http traffic does not reach there. I think its something to do with my proxy server. When I tried to use my ISP's proxy server, it connected.
I am getting an error Error Code 11002: Host not found.
So I am pretty sure that there is something in my proxy that is not allowing it but I cant seem to figure out what it could be.
Please help experts.
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On ISA , allow the URL site or domain sets that ISA may block it
http://www.isaserver.org/a
We tried giving the primary DNS for the ISA as our internal DNS server and the external as our ISP DNS server. but then we started getting another problem where the ISA kept asking for login credentials when trying to access any sites on the internet.
When we removed the secondary DNS (the ISP DNS), then it was fine but this site was again not accessible.
This site is not blocked and is in the allow list, so there is no rule blocking it. It just does not 'find' the host or server for http traffic. We are using ISA 2006.
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by: arnoldPosted on 2009-09-23 at 22:30:33ID: 25410310
Are you using a reverse proxy? Your issue might be the internal device tries to access an external resource that is mapped on the router to another internal device.
Often this is a feature that is enabled to prevent spoof/storms.
On the router web server public IP port is mapped to internal LAN ip port
Your internal proxy is trying to access public IP port, but the router does not allow the traffic from the inside to go out the external interface and then come back in.
One option is to maintain an internal DNS record for the external domain such that www.yourdomain.com internally points to the internal LAN IP while the external DNS record for www.yourdomain.com points to the public IP.
It requires additional management/record maintenance.