Server - Microsoft DTC & Firewall rules

Here it is official Microsoft article that explain on how correctly configure Distributed Transaction Coordinator (DTC) working properly through firewall (and relatives ports to be opened):

https://support.microsoft.com/en-us/topic/c3ccb2af-a9f8-180e-8e11-8565f6c654a2#:~:text=All%20ports%20must%20be%20in,of%2015%20to%2020%20ports