If you want to use Mgcamd for camd3 protocol connection, you need to specify filters at the end of the line, otherwise the package will not open.
Sample:
cs357x://login:password@xxx.dyndns.org:port?0500:020710=0500:020710&4AE0:000000=4AE0:000000 (sample of filter for NTV and Tricolor package)
The line is placed to /var/keys/camd3.servers file. Don't forget to specify the following parameter in Mgcamd config G: { 04 }