It looks like you're running Nginx / PHP FPM which will use port 9000 for the FPM process communication.
You can change this in your PHP-FPM configuration to either a different port or to use a local socket (preferable) if both Nginx and the php install are on the same machine) but be sure to update your Nginx site definitions to reflect this change as well.
For PHP search your php-fpm.conf for the listen directive:
; The address on which to accept FastCGI requests.
; Valid syntaxes are:
; 'ip.add.re.ss:port' - to listen on a TCP socket to a specific address on
; a specific port;
; 'port' - to listen on a TCP socket to all addresses on a
; specific port;
; '/path/to/unix/socket' - to listen on a unix socket.
; Note: This value is mandatory.
listen = 127.0.0.1:9000
And in Nginx update the fastcgi_pass directive:
fastcgi_pass 127.0.0.1:9000;
Restart both Nginx and PHP-FPM and you should be able to bind to port 9000 again.