Help me please.

[Lello]

About me I restart my pc it's going fine I can join the server

[Sausages]

Find the router configuration page to navigate to in your browser. Now if you successfully got on the router settings page, try to locate firewall settings and disable the router's internal firewall. Also try to make NAT less strict, for example you can add the local IP address or MAC of your PC you're playing MTA on, to the ''DMZ zone'' (opening all ports at once) which is now a safe procedure because the main router/modem is already filtering the signal.
Save the settings and reboot the router, now try again. If it still doesn't work, you can try repeating the same procedure on the main router. It might just not know how to handle traffic that is pre-processed by another router. Also, a Wifi repeater instead of using a second router can be a better idea.

Im not using any router, im using my phone's tethering as wifi for my laptop.

[Thunder]

If you can't see the gameplay mode of CIT, then the you must re-install your windows, I solved my problem with this solution.

[Sausages]

If you can't see the gameplay mode of CIT, then the you must re-install your windows, I solved my problem with this solution.

is this problem really need to make me reinstall my windows? , Although I still can get into other server, the problem just occurred on CIT's server

[Chamido]

Try to connect using a VPN maybe it will solve the problem.

[Luke]

Sausages, try what I have replied.

Although, you can try resetting your router, use a small pin (needle or anything that is small) and find a small hole on the back of your router (maybe on the side for yours), then press, and hold it for 10-15 seconds. After doing so, wait 5 minutes and turn off your router, wait for another 5 minutes then open your router.

[imGUNNER]

I had that problem but I think its ig bug : because I had to wait for some time and logged in and it worked normally ; thats what happend with me.

[Sausages]

Sausages, try what I have replied.

im not even have a router.

[Dragon]

maybe you're using 600x400 resolution, minimum resolution is 800x600.

[Sausages]

maybe you're using 600x400 resolution, minimum resolution is 800x600.

im using 1366 x 768

[Thunder]

is this problem really need to make me reinstall my windows? , Although I still can get into other server, the problem just occurred on CIT's server

Yes, this is what happened with me before, joining any servers but you can not join CIT only and I have tried all solutions but the only helpful solution is re-installing your windows again, because maybe there are some files are working agansit the server files or there are missing files, so the only way to fix this is re-installing your windows.

And as you can see in the topic that I stated in my last reply, I solved the problem with this solution and all other solutions didn't work.

[Nervous]

Any update? @Sausages

[Hobart.]

If your mobile thrending internet speed is very low , this could occure, that happened with me once and it got fixed when I recharged my SIM card with another gigabytes of internet, try recharging it , if it still occure try deleting all CIT server data and files , deleting them could help , not to mention that if you tried reinstalling MTA as they said while conserving all of your data won't help only when you delete them all may do.
Make sure that your windows or antivirus is not blocking MTA , give it access throught your firewall. And make sure to complete installing some windows files if your windows is suffering from a shortage of important files that got relation with games , always make sure to have the copyright of windows system, and regarding your last reply, formating your PC could help you with this, you can format it while keeping all of your files and your personal documents.
If it resists tell us, tried to help you with everything I know 

[Nervous]

Locked due to lack of interest.