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Updating the License Manager to version 10.3 may lead to the following error message when opening ArcMap:
With ArcGIS License Manager 10.3, a specific port in the range 27000-27009 must be specified for the lmgrd daemon as a requirement for configuring it for use with a portal. The service.txt file found in the install directory (..\Program Files\ArcGIS\License10.3\bin by default) now includes the port 27000 by default after installing ArcGIS License Manager.
If ArcGIS License Manager 10.3 was installed as an upgrade from an earlier version (for example, ArcGIS License Manager 10.2.2) and a port, such as 27004, was already specified in the earlier installation, this port may not be carried over into the new installation.
In this case, the port must be manually re-entered into the service.txt file. The lmgrd daemon port is communicated to the portal as part of the exported portal configuration *.json file.
If License Manager was locked to a specific port other than 27000, the ArcGIS Administrator (such as ArcMap) is no longer able to obtain a license from the License Manager. The following steps outline the process required to reestablish this connection for a 64 bit machine. File locations for 32-bit machines or installations other than default may have different file locations.
This should be between 27000-27009.
C:\Program Files (x86)\ArcGIS\License10.3\bin\service.txt
SERVER this_host ANY 27000
SERVER this_host ANY 27004