How to fix the error 'CURL error code 7' on FiveM server

My first vid gimme feedback! (useful links below)

There's a fix for this error that appers while joining the localhost on FiveM server
Error:
"Failed handshake to server 0.0.0.0:30120 - Failed to connect to 0.0.0.0 port 30120: Connection refused - CURL error code 7 (Couldn't connect to server)."

Note: This is for FX-Server

Useful links:

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Music: Hot Heat - Topher Mohr and Alex Elena (Youtube Audio)
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[connections]

I don't have cfx-server-data-master and server.cfg

[thewolfgaming]

where are thes files located please help

[DbunksGarage]

didnt work, the thing you did with the 30120 was already their for me

[PSRestocksEU]

You won't have that folder if you don't own the server. If you don't own the server and other users also cannot connect, simply contact a developer or owner of the server to fix it.

[abigbigmac]

All I did was open fivem folder location then removed the file named xml and boom didn’t even need to restart my game

[whiskyeet]

Damn, you made up a problem that really should never exist just to make a video.

[classic_hl]

Excuses; this doesn't work. CFG files don't configure, and this doesn't happen either. A simple ":" doesn't help.

[NESTAMAN]

I was with that problem and I did not have the video file. I solved it by opening ports 30120 and 30110 UDP + TCP on my router.

[damasogaymmer]

wooow dude, you saved my life, thank you so much!!!

[kindamixedup]

What do i do if i have the same code error 7 problem than you but im on internet host (MYHEBERGE)?

[chtioui]

my code has the two points already and doesnt work any help

[cheaterheater]

It red text on left side"Connection interrupted" How could fix that I will become hot-headed of this game

[viktordodevski]

OneSync (policy type onesync) is not allowed for this server, or a transient issue occurred. Problem when i join to the server (everything is correct with console, host and other) PLEASE HELP!!!!

[ZakChlebowski]

people cant join my server when joining, it just sais "timed out" and couldnt connect to the ip

[munozjordan]

weird cuz mine was like that from begininng and this still didnt work for me this didnt help me at all

[ghostgaming]

Hello i have that problem here to but my Server.cfg is set correctly and still have that error how can i fix it pls

[benjaminlucaschrahbock]

I need help. I have CURL Error 56 and dont know how to fix it

[mysic]

I need help with the connection it won't let me jon my server

[FellipeeGameer]

This error is displayed on server that is not mine

[jandanielmarcelo]

when i open the starter it automatically close