Maybe set up a temporary SSH tunnel for the duration of this burst traffic?
That was my first idea but i did not find how to do it from my tcl program, i never dealt with tunneling. i used to be ic circuit designer in the past and never software. now need to automate online routine work for living actually.
Again, if there no easy fix in blocker or firewall i will look around for other solution, will spend more time learning how to do tunneling in my environment.