Hi Vlad,
Is the computer on your local network or elsewhere on the internet? You may need to open port 1666 on your router before it will accept connections, if it’s not on your local network.
You should also take a look at the log - the server requires you to log in with a username or password - if you don’t, it will refuse your connection. If you’re the first person to use the server, you’ll need to hit “Create user” and create your account from P4V to both allow more accounts and claim superuser rights.
When it comes to creating your Workspace, I suggest only including /Source, /Content and /Config, as well as your .uproject file. Other folders and files will either cause unnecesary issues or are able to be regenerated by your teammembers locally.
If you have Teamviewer and need further assistance, I could help you out in realtime.