If your ISP is blacklisted it means the Internet Service Provider that enables your Internet (the company you get Internet from) is blacklisted or they've blacklisted the server.
It's not your IP address that's blacklisted. You'd have to use a VPN to get around this or change your Internet Service Provider. 
t_resa420 Lol. I hope the error stays for you, tbh. The user who made this post solved the "Lost reliable commands" error by uninstalling NpCap so I don't know why you think it's "dumb shit" to troubleshoot for other solutions.
I don't know why you have some vendetta against GPT either, it's a tool for getting information and it's reliable in a lot of situations.
If it was the SDK wouldn't it be happening to everyone since we're all using the same SDK the .exe is built with?
I don't know much about programming.
GPT says this so what do I know?
This error is due to corrupted data being sent to the server and causing the server to boot you for either security reasons or because the data is so unreadable the server gets rid of you. This can happen due to any device on your computer, be it a controller, mouse, keyboard, headset, anything.
This error can also happen due to network programs on your computer such as network monitoring tools. The image below is from a user who would get the "Lost reliable commands" error in seconds loading into a game. After they reinstalled drivers for some of their devices and uninstalled network programs unrelated to Windows, they've been playing for over an hour and it hasn't happened.
You need to properly uninstall drivers and reinstall them clean.
You need to uninstall network programs on your computer which aren't from Windows.
You can also copy and paste this script into notepad, save it as "systemhealth.bat", run it as administrator:
@echo off
DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow
netsh advfirewall reset
ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew
netsh winsock reset
netsh int ipv4 reset
netsh int ipv6 reset
netsh int ip reset
netsh int tcp reset
pause
It will fix corrupted OS issues.
It will fix corrupted System32 files.
It will restore the Windows Firewall to default.
It will restore winsock to fix any corruption of the functions used by the OS when sending/receiving data.
Running this script probably won't fix the "Lost reliable commands" but I'm putting it here, just in case.
ZirFox80s This is fascinating. I'll have to post this solution somewhere so Plutonium doesn't lose it! Thank you for trying so hard to find the cause. 
ZirFox80s Have you tried turning off your modem/router for 10 minutes and then switching it back on?
It happened right when I said "bet you didn't expect that erekt" because I got player "erekt" with a tomahawk when he tried to do the jump technique to get me behind my riot shield. It must've got triggered by mistake somehow. Can someone tag a nameless noobs admin to help me? 
ZirFox80s For the Rumble error, make a new post for it so if anyone else gets that error they can find the post.
As for the problem with the reliable commands error, it might be driver problem or it can be hardware problem. We'll see.
ZirFox80s Keep playing the game without the controller connected to the computer, don't even have the controller switched on so it can't connect by bluetooth.
Play with the mouse and keyboard for a while and see if the error happens.
And yes, it could be driver problem from the xbox 360 controller!
Open device manager and see if anything has a yellow exclamation mark or error symbol next to them.
Open powershell and type "get-pnpdevice" and see if anything is listed as not ok, you can ignore "unknown".
Can you try unplugging your mouse, keyboard, headset, and any other peripheral devices and only playing with the controller connected to the computer? You'll have to unplug your mouse when you pick a server to join.
Peripheral devices look like this:
I asked chat GPT:
People are getting an error in black ops 2 called "lost reliable commands", what can you tell me about this
Chat GPT said:
The "lost reliable command" error in Black Ops 2 typically occurs when there is a communication issue between the game client and the server. This error message indicates that the game client has not received acknowledgment from the server for a command that was sent, leading to a loss of synchronization.
To troubleshoot this issue, players can try the following steps:
I then asked:
How did you find that out?
Chat GPT said:
Based on the context provided and the nature of my programming, I am programmed to respond to certain keywords or phrases related to code, programming, and technical assistance. This allows me to provide relevant information and guidance to users seeking assistance in those areas.
ZirFox80s Thank you for this video! It's interesting how the game appears to be functioning normally and having no problems and then something happens and crashes you out.
Try going back into that lobby or custom game (however you set it up). Go to that specific area in Nuketown and try standing exactly where you were and aiming where you did when that crash happened. See if you can repeat that same crash from doing exactly what happened on the video.