Okay, I solved it. Actually the problem is not in duplicate names. I dont know why the server was reporting it. The problem was in permissions in filesystem, where the server couldn't access the files like region etc.
Hello, Ive made a 7 Days to die dedicated server recently on linux... Starting the server and everything works fine, but I am the only one, who cant connect. The server says "Denying player with duplicate name 'warmos'". How can i disable this ? I've tried turning of the EAC. Thanks in advance and sorry for my english