Why cant i ping port 3306?

Question

I have a router portforwarding ports (80 for example) and i can ping port 80 from a remote location because its forwarded and because its open on the server (ubuntu). I can open loads of ports and they all ping yet 3306 wont. I have done a netstat -tln and 127.0.0.1:3306 is being listened on. Router firewall is OFF but im still required to portforward to my local private IPs and ports.

Is my router broke, or is there something im missing, Ports arre open on server and router forewarded? 
Thanks for any responcces.

Robert J · Accepted Answer

Either the listener on port 3306 does not respond to ICMP Ping, or port 3306 is being blocked as a security measure by an ISP.


Be extremely careful of what ports you forward in and make sure you have a secure stateful firewall - opening ports at random is basically saying 'Hack me!' to the internet at large.

Linux is orders of magnitude more secure than Windows - but the lifetime of an unprotected Windows machine on an open internet connection is about 5 - 10 minutes.

I'd download and run 'chkrootkit' and see if it's already been compromised...


If you intend to run a system with any open ports, I'd also look at an enterprise-grade Linux distro like Centos that's properly bug- and security-tested, rather than an 'easy' build like Ubuntu - it has a far better chance of surviving.


[Electronics designer & programmer for 30+ years, also commercial system builder].

Boberelli · Answer

PING works for layer 3 (IP) addresses, not port numbers.  Your local (inside) IP is translated as an internet (outside) IP by the router, so if you PING the internet IP from outside, you're actually pinging the router not the translated address inside.

127.0.0.1 is a special address known as a loopback interface and it's not routable and resides on the local system.  If you ping 127.0.0.1 you're actually pinging the host you're on.

hope this helps!

? · Answer

Port 3306 is rather important as it is the default port for MySQL which you can Google if you want more information about it.
 Unless you are doing something like setting up a server then leave it well alone;
http://dev.mysql.com/doc/refman/5.0/en/security-guidelines.html
See the first paragraph under "checklist".
 Regards,  Bob.

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? · Answer

What do you mean by "ping the ports"?  I was not aware that you could ping specific ports.

Is this something in Unbuntu or Linux?

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Why cant i ping port 3306?

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