When the License Manager was activated, a random port was assigned as the ISV Server port. If that port is blocked you can either unblock it or use a different unblocked port as the ISV Server port. To use a different port, you must use the RLSA window to edit your existing extendsim.lic file:

Change ISV portFollow steps 1-3 in the FAQ Changing the default port (5053)...

At step 4, do not change port 5053. Instead, in the license file field, add "port=nnnnn" (where "nnnnn" is the port number) to the "ISV extendsim" line such that it reads "ISV extendsim port=nnnnn".

Then, continue with the remaining steps.