Same IP Cannot Connect

Hello, i want to ask why only 1 ip can connect to my server. already try with same and different license also didnt work. im using steam as an identifier . But when they all connect to other server with onesync it works . is it onesync problem or what?
thank you

Do you use a whitelist?

yes. im using discord whitelist

Then you have to whitelist their IP to! They have a different number on the end of the ocktet

also didnt work if i disable whitelist.

Have you restarted the complete server, and updated everything in your server?

yess , everything updated

Well then I don’t know man!

Have you fix your this problem? i also have this isse.