The socket connection error Permissiondenied in php in CentOS

The socket connection error Permissiondenied in php in CentOS

$ Fp = fsockopen (mx2qq.com, 25, $ errno, $ errstr, 300);]

This statement runs normally in the windows environment. the Error message Error number: 13, Error message: Permission denied is returned in the CentOS environment. how can this problem be solved?

Reply to discussion (solution)

SElinux should be switched off first and then try again

Insufficient permissions
Http://blog.csdn.net/pennyliang/article/details/7342042

Insufficient permissions
Http://blog.csdn.net/pennyliang/article/details/7342042

Thank you for your answers. the solution has been implemented according to the methods described in this document. The permission is indeed insufficient.