Can PHP socket work on closing port on web server?

Question

1.00/5 (2 votes)

See more:

I assume that: If port 2036 close on my web server. Can I use function socket_bind($sock, $address, 2036) on PHP code? Can anyone explain me about this question?

What I have tried:

I have tried a lot of port but it still doesn't work

Posted 23-Mar-17 16:19pm

Member 13072690

Updated 23-Mar-17 22:45pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jochen Arndt · Answer 1 · 2017-03-23T22:45:00

It is not quite clear what your problem is.

If you shutdown a server that is serving a specific port and you want to restart that server you have to observe some things.

There may be still open connections when shutting down (closing the socket). So the server should close active connections first. Those connections will be then in TIME_WAIT state. That means that they are not closed immediately but after some time: When receiving ACK for the FIN send before to indicate closing or after a time out (default is 2 * MSL / Maximum Segemnt Time which is 2 minutes by default). So you have to wait this time before binding the same port to a new socket or just try it (binding will fail while there are still connections in TIME_WAIT state).

But you can force ignoring of connections in TIME_WAIT state by using the SO_REUSEADDR socket flag which must be set before binding the socket (see PHP: socket_set_option - Manual[^] ). This flag should be always set for server sockets. But even when using it, you should close all connections and wait some time before closing the socket. This will hopefully close most connections to clients.