From the above I am assuming INHUSZ1-CASP is the hostname of the SpectroSERVER, correct?
The error indicates SBG could not connect to INHUSZ1-CASP. Recommend checking the following:
1. Network communication between the third party system and INHUSZ1-CASP
2. Hostname resolution between the third party system and INHUSZ1-CASP
3. Ensure there are no firewall issues between the third party system and INHUSZ1-CASP
4. Add the hostname or ip address of the third party system to the $SPECROOT/.hostrc file on INHUSZ1-CASP
5. Not 100% on this one but the sbgwimport command running on the third party system was run as the root user. I believe the user used to run the sbgwimport command has to be a valid user in the Spectrum database. I personally not run the command as the root user nor create a root user in the Spectrum database. I recommend creating a new user on the third party system. This user being the same username as the user that owns the Spectrum install on INHUSZ1-CASP
Joe