The Arcotadmin and UDS service will not start after modifying the $ARCOT_HOME\conf\arcotcommon.ini
[10/Apr/2016:06:48:44 -0400] "POST /arcotuds/services/ArcotUserRegistrySvc HTTP/1.1" 500 576
[10/Apr/2016:06:48:50 -0400] "GET /arcotadmin/adminlogin.htm?orgname=administrators HTTP/1.1" 500 - .
[FATAL] Startup Failure: File arcotcommon.ini is either missing or the section arcot/db/dbconfig is missing
[ERROR] Error while reading common configuration, arcot/db/dbconfig is missing in the ini files
While modifying the file there was something that was corrupted or an invalid setting was added
Removing the invalid section or restore the original file. In linux environments modifying a file in windows and simply coping the file to the linux machine may add ^M markers which would effectively corrupt the file.