4 Managing the Stingray Service Gateway configuration

Is it possible to increase the number of simultaneous connections? When synchronizing services with billing, I get errors: ctrl : too many connections=4,max_connections=4

Yes, you can do it by configuring the parameter - сtrl_max_connection=4

How will SSG handle the traffic priority by protocols? Will it consider traffic going to these AS in general flow or not? Will traffic pass through SSG, but not be processed at all, will netflow data be dumped?

local_passthrough=1 - traffic transit.
Traffic will not be fully processed, the only place where it will be counted is in the netflow on standalone systems.