LDAP: //CN=TS-Enterprise-License-Server,CN=site name,CN=sites,CN=configuration-container

Each license server should contain 50% of the CALs that you use for load balancing. If a license server does not have valid CALs, then that license server will attempt to refer to other license servers with valid CALs for license issuance. (This applies to both enterprise license servers and domain license servers.)

The following table provides a summary of high-availability scenarios for issuing temporary and permanent licenses.

Table 1   License Issuance Matrix

	License Server A - Available	License Server A - Down	License Server B - Available	License Server B - Down	License Server A and License Server B Down
New Client License	Issue temporary license for 90 days	Failover to License Server B	Issue temporary license for 90 days	Failover to License Server A	Fail to connect
Existing Temporary License	Issue permanent license for 52-89 days	Failover to License Server B	Issue permanent license for 52-89 days	Failover to License Server A	Allow connection until expired
Expired Temporary License	Issue permanent license for 52-89 days	Failover to License Server B	Issue permanent license for 52-89 days	Failover to License Server A	Fail to connect
Existing Permanent License	Allow connect—will reissue license at 7 days before expiration	Failover to License Server B	Allow connect—will reissue license at 7 days before expiration	Failover to License Server A	Allow connect—will fail when the CAL expires
Expired Permanent License	Reissue license with new expiration	Failover to License Server B	Reissue license with new expiration	Failover to License Server A	Fail to connect
Existing Windows 2000 License	Allow connection	Allow connection	Allow connection	Allow connection	Allow connection

Finally, administrators should use the Terminal Server Licensing Tool to ensure that at least 10% of their CALs are available on each license server. However, if available licenses are limited to a single license server that suffers an outage, clients with expired licenses will be denied access immediately, and clients with licenses that expire within the next 7 days will be denied access on their expiration dates.