when i install NTeleportation to my server, in the WebRCON it displays "

Fallback handler could not load library RustDedicated_Data/Mono/libkernel32

Fallback handler could not load library RustDedicated_Data/Mono/libkernel32.so

Fallback handler could not load library RustDedicated_Data/Mono/kernel32

Fallback handler could not load library RustDedicated_Data/Mono/libkernel32

Fallback handler could not load library RustDedicated_Data/Mono/libkernel32.so

Fallback handler could not load library RustDedicated_Data/Mono/libkernel32

Fallback handler could not load library RustDedicated_Data/Mono/data-0x55acd12ce310.so

Fallback handler could not load library RustDedicated_Data/Mono/data-0x55acb7bc2830.so

Fallback handler could not load library RustDedicated_Data/Mono/data-0x55acb7bf0710.so

Fallback handler could not load library RustDedicated_Data/Mono/data-0x55acb7c12850.so

Fallback handler could not load library RustDedicated_Data/Mono/data-0x55acd0da2d80.so"

and when i try to load into the server, it simply displays "Disconnected: Connection Attempt Failed" 

I'm not sure why this occurs, but it only happens when NTeleportation is loaded onto the server

All of the above messages are not actually errors, just debug output from the game and Unity. N Teleportation or any plugin would not cause those, they are normal and part of the game itself.

As far as the "Disconnected" issue, it would sound like your server is either nor accessible via the method you are attempting, or the server isn't actually fully started. If you are connecting to it locally on the same machine, you'd need to your localhost or 127.0.0.1.