Strange networking issue possibly regarding Windows 10

[AdamN]

"1501 -> 1" means the port "1501" was the source/sender port detected when the data being received, while "1" is the port the game was expecting, both ports in "xxx -> yyy" are not supposed to include port offset value (both should be "1" if it was a correct port).

When i had this issue on Android(sender) vs Windows(receiver), that "1501" was a random number that have no relation to port offset (which is weird), so it's interesting if you were able to get that message containing some number related to port offset, but still weird if it only happened occasionally.

Btw, is this only occurred when playing between Win7 vs Win10? or Win7 vs Win7, or Win10 vs Win10 will also get this message?