My ArcGIS is not working it says it could not connect to an arcgis license manager running host
Probably the time period for use expried, or wants another serial number. Find some cracks for the verison of ArcGIS you use and reinstall the program with cracks. I hope it helps.
If the prolems is in hosting, I cannot help.
Probably you need to renew your license or check with the manager to see what the problem is