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New Windows Network policy and access server (Radius) not working

scottcummins
Beginner
Beginner

CISCO Gurus

 

I currently have an older Windows 2008 Server set up as a RADIUS and all worksa well. I built a new Windows Server 2019 RADIUS Server to replace it. theyt are BOTH Virtual MAchines in a VM enbvironment. If I change the settings inside of one of my CISCOP 3750 switches to point to the new one it works fine

 

However if I chage the IP and name of the new one to the IP and name of the old one. it does not work. and the company wireless stops working.  I am wondering if there is some cache that might have to be cleared of a MAC address or if someone had seen this before?

9 REPLIES 9

Seb Rupik
VIP Advisor VIP Advisor
VIP Advisor

Hi there,

Since you don't explicitly mention it in your method, does the new server have the same shared RADIUS secrets for all devices  as the old one?

 

cheers,

Seb.

Seb

 

yes, Same shared secrets as the old one

Sorry, should have read the first paragrpah! :)

 

Try clearing the ARP cache of the switch which routes the VLAN which the RADIUS server is connected to:

 

clear arp-cache <server_ip_address>

 

This will force the switch to ARP for the new server.

 

cheers,

Seb.

 

 

 

SEB

 

SO the VM infrastructiure is connected to a pair of switches that forwards traffic to a core 6509 which actually does the VLAN routing. Would clearing the cache on the switches the VM infrastructure is connected to do it, or do I actually need to clear the cache on the 6509? I don't really want to do anything on the core 6509 switches during businees hours ( I think I already know the answer, but verification from a more seasoned expert is always a plus)