Hey all, I struggled with the 10.3.1 license manager for 3 days. My issue was an incompatible port number in the C:\Program Files (x86)\ArcGIS\License10.3\bin\service.txt file. VENDOR ARCGIS PORT=1234 (worked for 10.2) VENDOR ARCGIS PORT=27010 (worked for 10.3.1) After changing the port to 27010, everything works fine. Hope this helps!
... View more