The default timeout for FLEXlm v8.4a or newer is only 100000 microseconds. If the client cannot connect to the server within this time period, the application returns a "-15" error and exits.
You can avoid timing out by increasing the timeout value to
microseconds. To increase the connection timeout from the client machine, set the following environment variable (choose Control Panel > System > Advanced > Environment Variables > System Variables > New) and enter the Variable name as follows.