The AdminStudio application is failing to activate through the FlexNet Publisher Server.

Upon checking the FlexNet Publisher Server mvsn log, you find the following:

10:00:00 (mvsn) Ecomms: Encrypted Communication disabled
10:00:00 (mvsn) TCP_NODELAY NOT enabled
10:00:00 (mvsn) Listener Thread: running
10:00:00 (mvsn) Starting diagnostics port listener thread (DPLT)
10:00:00 (mvsn) Starting diagnostics output thread (DRQT)
10:00:00 (mvsn) DPLT: running
10:00:00 (mvsn) DRQT: running
10:00:00 (mvsn) DPLT: waiting for logger to connect
10:00:00 (mvsn)  'ASIDE' from <username>@<servername> refused
10:00:00 (mvsn) Not master server, checkout attempt of 'ASIDE' from <username>@<servername> refused

Attempts to restart the system and services to no avail.

Solution

Method #1

Check that the configured FlexNet Publisher Server Ports are open. This applies for both the FlexNet Publisher Server and Vendor Daemon. 

Method #2

In the license file, C:\Program Files (x86)\Flexera Software\FlexNet\Licensing Server\licenses\mvsn, change the file first line from something like this:

SERVER this_host ANY
VENDOR mvsn mvsn/mvsn

to

SERVER this_host ANY PRIMARY_IS_MASTER
VENDOR mvsn mvsn/mvsn

Then restart the services - lmadmin and FNPLicensingService.exe - for the changes to take effort OR reboot the server