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The problem is that, often, due to the large number of maps or saves on the server player's computer, the client player cannot handle such a volume of information (when reading the headers of maps or saves). Delete or move all maps located in the Maps and Random Maps folders, for example, to some subfolder, but leave at least one map in the Maps folder that can be played over the network. Do the same with the Games folder, where the game saves are stored. Leave up to 10-15 necessary saves in this folder, and delete or move the rest to another location for storage.
Sometimes, even this doesn't help. Then the solution is to create the game somewhere else or through a third player, save, and load the save. There are usually no problems when loading in such cases. I played against an opponent in the Heroes of Might and Magic cup this way: it was impossible to create a game from home; it was reading the headers, although there were only 3 files in the folders. We started when the opponent could play from work, we saved, and then calmly finished the game from home.