This has to be the most bizarre issue I have come across.
I have one ISA server (2000) and a bunch of servers behind it. (all 2000).
The problem is this:
We are coming of ISA and into the CISCO PIX solution scene.
The PIX is all configured and running 'A' ok, ready for the migration.. BUT...
One of the tasks my platform does is receive a request from mobile SMS gateway it then passes on that request to a module written by us, finally it uses a standard GET request in ASP to post it to a web server (in this case itself, or any machine I set it to). HOWEVER...
when ISA is in place, the job is all done fine. When the Cisco is place, the job fails.
The request from the gateway comes in all ok with the Cisco in place, the platform attempts to make this GET asp post to a web server but it just fails.
It cant do it. Bare in mind the GET request it does is to a LOCAL web server running on itself. It has passed the firewall, it has come into the network yet it cant make a simple get request to itself. When the ISA box is in place, it does it just fine. Is there some rubbish thing ISA adds to packets that allows them to see IIS web servers?
Its the most bizarre problem. I don’t even see how ISA has anything to do with it. The packet has entered the network it has been received by the application, the application then just creates a simple GET request to itself or to a machine I designate. When ISA is in place it works, when ISA isn’t and Cisco is, it fails.
High points due to the urgency of the matter and the bizarreness..