I don’t see that anyone has spelled out the specific risk with SSH port forwarding in detail. If you are inside a firewall and have outbound SSH access to a machine on the public internet, you can SSH to that public system and in the process create a tunnel so that people on the public … Read more
It doesn’t provide any serious defense against a targetted attack. If your server is being targetted then, as you say, they will port scan you and find out where your doors are. However, moving SSH off the default port of 22 will deter some of the non-targetted and amateur script kiddie type attacks. These are … Read more
You misunderstand port numbers: a server listens only on one port and can have large numbers of open sockets from clients connecting to that one port. On the TCP level the tuple (source ip, source port, destination ip, destination port) must be unique for each simultaneous connection. That means a single client cannot open more … Read more
I did mysql> SHOW GLOBAL VARIABLES LIKE ‘PORT’; And that indicated that I was using port 3306 and that my search for the error continues.
I know this is an old thread, but in case anyone else is having the same issue, I had… What may be happening is that your process had a TCP port open when it crashed or otherwise exited without explicitly closing it. Normally the OS cleans up these sorts of things, but only when the … Read more
(2^16)-1, or 0-65,535 (the -1 is because port 0 is reserved and unavailable). (edited because o_O Tync reminded me that we can’t use port 0, and Steve Folly reminded me that you asked for the highest port, not the number of ports) But you’re probably going about this the wrong way. There are people who … Read more
Specifically TCP 9418, no need for UDP. Reference.
Port 25 needs to be open in order for it to receive mail from the internet. All mail servers will establish a connection on port 25 and initiate TLS (encryption) on that port if necessary. Secure SMTP (port 465) is used only by clients connecting to your server in order to send mail out. Port … Read more
When localhost parameter given, MySQL uses sockets. Use 127.0.0.1 instead.
Since you are on a Windows machine, these things can be done: Execute the following command and look for a “:3306” listener (you did not mention UDP/TCP). This will confirm there is something running on the port. netstat -a -n After this, if you are expecting incoming connections on this port and feel that the … Read more