Unable to access hosted company website from the company's LAN, ok from outside

Question

In my company the LAN is under a Windows domain called mycompany.com.

We also have a website www.mycompany.com which is hosted elsewhere. From outside our LAN the website is reachable, while from our LAN I get the following error:

10061 - Connection refused
Internet Security and Acceleration Server

If I try to ping the address www.mycompany.com from outside our LAN I see it actually resolves to a different symbolic name blog.othercompany.com, then I get its actual IP 1.2.3.4.

On our DNS under Forward lookup zones / mycompany.com I set a new host www and assigned it the IP address 1.2.3.4. Then I can ping www.mycompany.com from any PC in our domain but I still can't reach the website.

So I tried a different thing: instead of defining a host www, I defined an alias www that points to blog.othercompany.com, and again I can ping it correctly, but it still doesn't work.

If I don't have an entry for www in the DNS I can't even ping www.mycompany.com (obvious, but I had to try).

I've tried doing a test with portqryui, from within our LAN, and I can see ports 80 and 443 are open and listening. I've tried with multiple browsers, to no avail. I can't understand why I can't access the website.

Any suggestions? Thank you very much.

Answer 1

Apparently, the problem solved itself after a while. I checked again and now it works... I guess joeqwerty was right and the problem was with ISA, maybe it was caching the original DNS request or something.