The problem is that it is not possible to connect with the modified version, the usual one downloads quietly. The antivirus did not find anything, I will try with DNS, of course, but there are no ideas anymore.
I would also like to clarify that the first launch of Forge is successful and everything works, after restarting the launcher or computer, the error I described comes out. The problem with DNS and other things would be already at the first stage, or am I wrong?