This is what you’ll see in SoftimageLicense.log if Softimage cannot connect to the license server.
For example, if ADSKFLEX_LICENSE_FILE is pointing to the wrong server, you’ll see this sequence of errors in the log:

• Cannot connect to server
• License check out failed
• The desired vendor daemon is down
• License check out failed

6016	2010/03/15	12:40:22	Reason=Fatal error
6016	2010/03/15	12:40:22	ComputerName=MTL-EXAMPLE
6016	2010/03/15	12:40:22	OS=6.0.6001.Service Pack 1
6016	2010/03/15	12:40:22	File=AdlmIntNWFBLicense.cpp,Line=684
6016	2010/03/15	12:40:22	VendorID=3 [FLEXLM-NW]
6016	2010/03/15	12:40:22	VendorError=-15 [Cannot connect to server]
6016	2010/03/15	12:40:22	FLEXLM-NW=v11.6.1.3 build 72149 x64_n6
6016	2010/03/15	12:40:22	Reason=Fatal error
6016	2010/03/15	12:40:22	ComputerName=MTL-EXAMPLE
6016	2010/03/15	12:40:22	OS=6.0.6001.Service Pack 1
6016	2010/03/15	12:40:22	File=AdlmIntNWFBLicense.cpp,Line=667
6016	2010/03/15	12:40:22	AdlmIntError=20 [License check out failed]
6016	2010/03/15	12:40:41	Reason=Fatal error
6016	2010/03/15	12:40:41	ComputerName=MTL-EXAMPLE
6016	2010/03/15	12:40:41	OS=6.0.6001.Service Pack 1
6016	2010/03/15	12:40:41	File=AdlmIntNWFBLicense.cpp,Line=684
6016	2010/03/15	12:40:41	VendorID=3 [FLEXLM-NW]
6016	2010/03/15	12:40:41	VendorError=-97 [The desired vendor daemon is down]
6016	2010/03/15	12:40:41	FLEXLM-NW=v11.6.1.3 build 72149 x64_n6
6016	2010/03/15	12:40:41	Reason=Fatal error
6016	2010/03/15	12:40:41	ComputerName=MTL-EXAMPLE
6016	2010/03/15	12:40:41	OS=6.0.6001.Service Pack 1
6016	2010/03/15	12:40:41	File=AdlmIntNWFBLicense.cpp,Line=667
6016	2010/03/15	12:40:41	AdlmIntError=20 [License check out failed]