FLEXlm Licensing Services Won't Start/System Settings Tab Crashes LMTOOLS

This issue was observed on a Windows 2003 Server: after a new installation, FLEXlm licensing services would not start, giving the error:

System Error: 10035 "WinSock: Operation would block"

In addition, attempts to access the System Settings tab in LMTOOLS would cause the utility to crash.

The cause of the issue was related to the DEP feature in Windows 2003, which prevents the applications from functioning correctly. By adding all FLEXlm executables (lmgrd.exe, lmtools.exe, lmutil.exe, and any vendor-supplied licensing daemons) to the DEP exception list, the problem was resolved. To do this:

1. Click Start, then right-click on My Computer and choose Properties.
2. Click the Advanced tab.
3. Under the Performance section, click the Settings button.
4. Click the Data Execution Prevention tab.
5. Click the Add... button and browse to each of the applications, adding all of them to the list.

Other causes of the Winsock 10035 error may be related to ports being blocked by the system firewall, or an incorrect license file (server name/host ID do not match).

Thanks to JTB World Blog for the tip.

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