If the Session Host cannot contact the License Server, users will be unable to log in after the grace period. Always ensure ports are open between the RDSH and the License Server and that the License Server is published in Active Directory.
: This server manages and tracks RDS CALs. It's essential to have a functioning license server to maintain RDS access. rds license
| Type | Best for | How it works | |------|----------|----------------| | | Organizations where users have multiple devices (PC, laptop, tablet) | One license covers one user on any number of devices | | Per Device CAL | Shift workers or shared workstations (e.g., factory floor, hospital) | One license covers one device used by multiple users | If the Session Host cannot contact the License
However, RDS licensing is notoriously complex. It involves specific server roles, license types, and strict activation protocols. Misunderstanding these elements can lead to non-compliance or, more commonly, a sudden halt in services when the grace period expires. It's essential to have a functioning license server
| Problem | Likely Cause | Solution | |---------|--------------|----------| | | No license server or incorrect configuration | Install and activate license server; point session hosts to it | | Event 205 (license server unavailable) | Firewall blocking port 135 (RPC) or TCP 445 | Open required ports or check service (Remote Desktop Licensing) | | Per User CALs not tracked correctly | License server in Domain Group Policy or AD mismatch | Ensure license server is discovered via GPO or registry; Per User CALs are tracked in AD, not in LS | | Temporary licenses issued (Event 17) | License server has no installed CALs | Install appropriate number of RDS CALs for your environment |
: On your Windows Server, go to the Server Manager, and install the RDS Licensing role.
: RDS licensing is often misunderstood, leading to costly audit risks or service interruptions. Set up your license server early, pick the right CAL type for your environment, and don’t rely on the 120-day grace period for production.