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13:55:57 (lmgrd) Starting vendor daemon at port 27000
13:55:57 (lmgrd) Using vendor daemon port 27000 specified in license file
13:55:57 (lmgrd) REStarted ARCGIS (pid 5572)
13:55:57 (ARCGIS) FLEXnet Licensing version v11.10.0.0 build 95001 i86_n3
13:55:58 (ARCGIS) Server started on prvgis2 for: ACT
13:55:58 (ARCGIS) Viewer Viewer
13:55:58 (ARCGIS) EXTERNAL FILTERS are OFF
13:55:58 (lmgrd) ARCGIS using TCP-port 0
13:55:58 (ARCGIS) tcp_s is bad!!! Exiting
13:55:58 (ARCGIS) EXITING DUE TO SIGNAL 28 Exit reason 5
13:56:03 (lmgrd) ARCGIS exited with status 28 (Communications error)
13:55:57 (lmgrd) Starting vendor daemon at port 27000
13:55:57 (lmgrd) Using vendor daemon port 27000 specified in license file
13:55:57 (lmgrd) REStarted ARCGIS (pid 5572)
13:55:57 (ARCGIS) FLEXnet Licensing version v11.10.0.0 build 95001 i86_n3
13:55:58 (ARCGIS) Server started on prvgis2 for: ACT
13:55:58 (ARCGIS) Viewer Viewer
13:55:58 (ARCGIS) EXTERNAL FILTERS are OFF
13:55:58 (lmgrd) ARCGIS using TCP-port 0
13:55:58 (ARCGIS) tcp_s is bad!!! Exiting
13:55:58 (ARCGIS) EXITING DUE TO SIGNAL 28 Exit reason 5
13:56:03 (lmgrd) ARCGIS exited with status 28 (Communications error)
I also face the same issue with license manager 10.6
I have tried to move the vendor port from 27001 to 27000 and 27009, but still no luck. So I deauthorized the license and clear the trusted storage. And voila! It works!!