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Going to need more info to help you out! What do you mean "the other one can't join"? Do you get an error? Does it crash? Do you not see the other player's lobby?
How are you trying to connect to each other? Via Steam Friends' list? Are you typing in an IP manually? Are you using a virtual network adapter (such as Hamachi)? Have you both made sure Castle Story is allowed through your firewall?
For quicker help, consider joining the Discord: https://discord.gg/CastleStory
You can also contact us on http://support.castlestory.net
Can you confirm both you and your friend have allowed Castle Story through your firewall? You won't be able to play multiplayer otherwise.
Ideally, post a screenshot of Castle Story's properties in your Firewall settings so I can doublecheck that everything is right.