Can't open port

I'm trying to open a port but I'm not getting through.

Using tools like the following to check by entering the server's IP:
Open Port Check Tool - Test Port Forwarding on Your Router
Port Checker - Check Open Ports Online

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I've added the port to CSF (TCP & UDP + restart) and I've also tried disabling CSF. Didn't work, so I figure there might be something else blocking the port? Maybe my host?

Any other idea how to open this port? I'll contact my host just in case.

 

They said they're no blocking the port.

 

Code (Text):

egrep '^TCP_|^TCP6_|^UDP_|^UDP6_' /etc/csf/csf.conf
TCP_IN = "20,21,22,25,53,80,110,143,161,443,465,587,993,995,1110,1186,1194,8083,81,9418,30001:50011"
TCP_OUT = "2525,465,1110,1194,9418,20,21,22,25,53,80,110,113,443,587,993,995,8083"
UDP_IN = "67,68,1110,33434:33534,20,21,53,8083"
UDP_OUT = "67,68,1110,33434:33534,20,21,53,113,123,8083"
TCP6_IN = "20,21,22,25,53,80,110,143,161,443,465,587,993,995,1110,1186,1194,81,9418,30001:50011"
TCP6_OUT = "2525,465,20,21,22,25,53,80,110,113,443,587,993,995"
UDP6_IN = "20,21,53"
UDP6_OUT = "20,21,53,113,123"

 

I've done that after editing, but I've just done it again.

Code (Text):

telnet server-IP 8083
Connecting To server-IP...Could not open connection to the host, on port 8083: Connect failed

Code (Text):

telnet domain.com 8083
Connecting To domain.com...Could not open connection to the host, on port 8083: Connect failed

Tried from my local computer this time and it didn't work.

Linode already confirmed that they're not blocking the port.