PEAR Mail unable to connect to Gmail SMTP, failed to connect to socket

Question

Facts

I am using PEAR Mail, I want to use gmail SMTP to send a mail. I have Apache/2.4.27 (Win64) PHP/7.2.0beta3, PEAR 1.10.15, Mail 1.4.1, Net_SMT

Answer 1

Been Kyung-yoong is the only person to have made a meaningful contribution to solving the problem so far (+1 Been!). I can confirm his result. And I would recommend you try the same. You are currently trying to debug a rather complex stack of components:

• Error is being thrown by PEAR smtp here
• Which is failing when it calls Net_SMTP::connect()
• which is a wrapper around Net_Socket::connect()
• which is rather elaborate wrapper around fsockopen()

Been is doing your job for you - as the person posting the question - should be creating a Minimal, Complete, and Verifiable example

This will hopefully also provide more meaningful diagnostic information.

The most likely reasons for this to be failing are:

• the host you are running this on cannot route outgoing connections to the internet (but since you seem to be using a desktop PC, I would think you might have noticed this by now)
• the code is running within a security sandbox (but MSWindows doesn't really have such things)
• the host is unable to resolve the hostname (see first point about routing)
• the host is able to connect but unable to verify the certificate

Hence you might consider this more elaborate implementation of a test script:

 $v) print "$k = $v\n";
 } else {
     print "You've not configured your openssl installation on this host\n";
 }

 print "\nIf all good so far, then this bit should work....\n";
 print "fsockopen\n";
 var_dump(fsockopen("ssl://smtp.gmail.com", 465, $errno, $errstr, 3.0));
 var_dump($errno);
 var_dump($errstr);

Which should give you a response like this:

 DNS
 bool(true)
 array(5) {
   [0]=>
   string(31) "alt1.gmail-smtp-in.l.google.com"
   [1]=>
   string(31) "alt2.gmail-smtp-in.l.google.com"
   [2]=>
   string(31) "alt4.gmail-smtp-in.l.google.com"
   [3]=>
   string(26) "gmail-smtp-in.l.google.com"
   [4]=>
   string(31) "alt3.gmail-smtp-in.l.google.com"
 }
 IPV4 address = 74.125.131.26

 If you've got this far without errors then problem is with your SSL config
 Check you've got your cacerts deployed in one of the following locations
 default_cert_file = /usr/lib/ssl/cert.pem
 default_cert_file_env = SSL_CERT_FILE
 default_cert_dir = /usr/lib/ssl/certs
 default_cert_dir_env = SSL_CERT_DIR
 default_private_dir = /usr/lib/ssl/private
 default_default_cert_area = /usr/lib/ssl
 ini_cafile =
 ini_capath =

 If all good so far, then this bit should work....
 fsockopen
 resource(4) of type (stream)
 int(0)
 string(0) ""

Given that we can't replicate your error we can't give a definitive answer what the problem is - but my guess would be that you haven't configure openSSL.