Destination PC does not allow too many connections

[jwalkerbg]

I managed to use RealTimeSync as service under AlwaysUp. Initially, this went well. However, I created up to 22 instances of RealTimeSync that synchronize many folders from the source pc with the destination PC. The source PC is Windows Server 2016, and the destination server is Windows 10 Pro.

The destination PC began to be not reachable via Windows Explorer, the shares not accessible and RTS could not do its work.

I realized that I reached some limit in the destination PC - no more connections, no more open files possible or something in this sort. The error was 0x80070035 or 0x80004005.

When I disable several instances of RTS, the ability to make connections to the destination PC restores.

Now I wonder and need help where to go. What is the way?
-- to increase allowed connections and/or disable the limitation in the destination PC;
-- or to not use so many RTS instances and to go to use par example Task Scheduler that will run FreeFileSync batch files in the night.

What is the practice in such cases?

Ivan