The out of sync error in MP is usually by a file edited, such as a map in the resource folder. With the 1.17.5 patch, its usually caused by the difference in the English version and Russian version of the patch. So you won't be able to play with a person using Russian version if you have English version.
As for the buffer overflow, I've no idea. If you want to risk it, try it without your firewall or make exceptions for MoW if you can.
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