Can a TS user logon if the licensing server runs out of the TS CALs

Yes, if your license server runs out of the TS CALs, the license server issues 90-day temporary license tokens to unlicensed clients. That prevents denying service to a TS client and gives you time to purchase any additional required licenses. If the temporary license expires after 90 days without a TS CALs available, the client will be denied to access the TS.

How to setup terminal services

Making Sure That Your Terminal Server Can Detect the License Server Matching Terminal Server Mode with Types of CALs Purchased ...
www.howtonetworking.com/articles/mstshowto.htm - Similar pages

How to setup TS licensing server

How to Install and Configure TS Licensing. How to administer Terminal Services Licensing - How To Activate a TS License Server in Windows Server 2003 ...
www.howtonetworking.com/RemoteAccess/tsls.htm

Troubleshooting terminal server issues

"No TS licensing server error when run TS license manager" "No Terminal Services licensing server is available in the current domain or workgroup" ...
www.chicagotech.net/troubleshootingts.htm

Troubleshooting TS licensing issues

Troubleshooting Terminal Services Licensing issues. Cannot find TS licensing server · No more TS licenses are available - Case Study ...
www.chicagotech.net/server/tsls.htm