Need help on private server.

Hello. I'm a new member in this forum and I currently made a hamachi-run v75 maplestory private server. I am only making this for one friend who is going to be the only one on the server with me, so I decided to open it via hamachi. Sadly, my friend cannot get into the server, despite him being listed on my hamachi server. I can get into the server just fine, and everything is working, but I don't know why he can't get in. It would be great to see some suggestions or pointers to fix this issue, and thank you for reading. ^^

Did you stredit the Client ?

Do you mean use hex editor to put my ip in the client? Yes, I did that. o3o

Your using hamachi so you made it to that ip correct .___. ?

Yes. I wrote down the right ip.

When he attempts to open the launcher, does it close and gives him a error ? Saying something like "Failed to Connect to Server, ...etc"

Yes. Did I do something wrong?

Add me on skype Dphammy, ill try and help you out, I had that problem but can't remember correctly what i did