vg

Hi Scott

Thank you for your reply.

I have checked for open ports with a portscanner, and get (no reply) on
those ports. Do you have any other suggestions? I can not understand why my
server is not replying on Radius request. I have no FW between or on the
server.

daniel mauser

It's going to be hard to detect this using a port scan or telnet because IAS
RADIUS ports are UDP 1812 and UDP 1645
Type netstat -na in you IAS box and check if they are listening like:

UDP 0.0.0.0:1812 *:*
UDP 0.0.0.0:1645 *:*

Those port are going to be listeing only if you register your IAS in Active
Directory (Open the IAS admin console rigth clink in Intenet Authetication
Service and then click in: Register Server in Active Directory)

Daniel Mauser.

vg

Thank you, for the useful information, the server is Register Server in
Active Directory and with help the help of your command I was able to verify
that the server is replying to the ports. This helps me to locate the problem
to my “auth server�

One more question. There is two NIC in the IAS servers; does the IAS server
listen on both NIC? Do you know how I can specify which NIC the IAS listen
on? Or check which it already listens on?

daniel mauser

It's good to know it is working

Answering your question: It depends how your IAS box is configured. Usually
when you have UDP 0.0.0.0:1812 it means the port is listening in all
adapters. However, if you have RRAS installed in the same IAS box and your
"Internet" NIC is configured in RRAS with public and basic firewall is
check. In this case IAS ports will be available to access only in "internal"
NIC. If you dont have RRAS or Windows Firewall enabled IAS port are listeing
in all NICs.

Daniel Mauser.

vg

Thanks again for helpful information. I appreciate your posts and comments.

I will continue my problem solving.