title: Perl IO::Socket::SSL: connect: Network is unreachable
body: <p>Any code using Mail::IMAPClient is having this error. To verify I have used the below example from the topic: <a href="https://stackoverflow.com/questions/2364099/how-do-i-authenticate-into-gmail-using-perl">How do I authenticate into Gmail using Perl?</a></p>
  
  <pre><code>#!/usr/bin/env perl -w
  use strict; use warnings;
  use Mail::IMAPClient;
  
  # Connect to IMAP server
  my $client = Mail::IMAPClient-&gt;new(
    Server   =&gt; 'imap.gmail.com',
    User     =&gt; $user,
    Password =&gt; $pass,
    Port     =&gt; 993,
    Ssl      =&gt;  1,
    )
    or die "Cannot connect through IMAPClient: $@";
  
  # List folders on remote server (see if all is ok)
  if ( $client-&gt;IsAuthenticated() ) {
    print "Folders:\n";
    print "- ", $_, "\n" for @{ $client-&gt;folders() };  
  };
  
  # Say so long
  $client-&gt;logout();
  </code></pre>
  
  <p>Now, I have gone through questions similar to this but have never seen such a strange error like "Network Unreachable". There is no actual network problem, ping works fine. I have IO::Socket::SSL, Net::SSLeay installed.</p>
  
  <p>$ echo -n | openssl s_client -connect imap.gmail.com:993</p>
  
  <pre><code>CONNECTED(00000003)
  depth=2 C = US, O = Equifax, OU = Equifax Secure Certificate Authority
  verify return:1
  depth=1 C = US, O = Google Inc, CN = Google Internet Authority
  verify return:1
  depth=0 C = US, ST = California, L = Mountain View, O = Google Inc, CN = imap.gmail.com
  verify return:1
  ---
  Certificate chain
   0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=imap.gmail.com
     i:/C=US/O=Google Inc/CN=Google Internet Authority
   1 s:/C=US/O=Google Inc/CN=Google Internet Authority
     i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
  ---
  Server certificate
  -----BEGIN CERTIFICATE-----
  MIIDWzCCAsSgAwIBAgIKFefcnAADAAA7OzANBgkqhkiG9w0BAQUFADBGMQswCQYD
  VQQGEwJVUzETMBEGA1UEChMKR29vZ2xlIEluYzEiMCAGA1UEAxMZR29vZ2xlIElu
  dGVybmV0IEF1dGhvcml0eTAeFw0xMTExMTgwMjAxMjRaFw0xMjExMTgwMjExMjRa
  MGgxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlhMRYwFAYDVQQHEw1N
  b3VudGFpbiBWaWV3MRMwEQYDVQQKEwpHb29nbGUgSW5jMRcwFQYDVQQDEw5pbWFw
  LmdtYWlsLmNvbTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAmv2pvvhXOyOA
  Uq053VLGMAErgk2NcDzxWNB5PWwXHzkcFuZOa0q1YUlff6LaJurq5UctkOO+3mt1
  L+/wcZiEzxTdfOclyJcY/qBsjz8qgG+4Kx3/dVlTYz2geUyxvGNibNQfuXpoI1M5
  iUQ/FSaFIazXZ01tpb+mgCOtwzENMk8CAwEAAaOCASwwggEoMB0GA1UdDgQWBBRd
  l+HsAH5IwfNuc25lLuryGEaXwzAfBgNVHSMEGDAWgBS/wDDr9UMRPme6npH7/Gra
  42sSJDBbBgNVHR8EVDBSMFCgTqBMhkpodHRwOi8vd3d3LmdzdGF0aWMuY29tL0dv
  b2dsZUludGVybmV0QXV0aG9yaXR5L0dvb2dsZUludGVybmV0QXV0aG9yaXR5LmNy
  bDBmBggrBgEFBQcBAQRaMFgwVgYIKwYBBQUHMAKGSmh0dHA6Ly93d3cuZ3N0YXRp
  Yy5jb20vR29vZ2xlSW50ZXJuZXRBdXRob3JpdHkvR29vZ2xlSW50ZXJuZXRBdXRo
  b3JpdHkuY3J0MCEGCSsGAQQBgjcUAgQUHhIAVwBlAGIAUwBlAHIAdgBlAHIwDQYJ
  KoZIhvcNAQEFBQADgYEAa6JYZBInXMfojI4bXLusfDlzZ6gnGtHxOO8hUZbDAwcL
  t2/4uDDj8sroVrTWXMqURzk1lCsXlGPFhaKdnsMrmcgC01THAKPFrrQnQc/BM5H/
  kr5ZAyJKHyu4dNnL3NNjig+22fp8slaLo25C95YQT5LiBL2qnAzLs4nWBzqih74=
  -----END CERTIFICATE-----
  subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=imap.gmail.com
  issuer=/C=US/O=Google Inc/CN=Google Internet Authority
  ---
  No client certificate CA names sent
  ---
  SSL handshake has read 1850 bytes and written 299 bytes
  ---
  New, TLSv1/SSLv3, Cipher is RC4-SHA
  Server public key is 1024 bit
  Secure Renegotiation IS supported
  Compression: NONE
  Expansion: NONE
  SSL-Session:
      Protocol  : TLSv1
      Cipher    : RC4-SHA
      Session-ID: D98F3659858A0F39D32F1B5D96F756DE6E093E849A6AE0066C391BE2881B9A69
      Session-ID-ctx: 
      Master-Key: 8D4BE4DFEB7F3218A501FE9240E0B51CC987B99EE0DDBA5EC13E9A10137B63508692DA684DA25E8B2839906F0F7ADDD5
      Key-Arg   : None
      Krb5 Principal: None
      PSK identity: None
      PSK identity hint: None
      TLS session ticket lifetime hint: 100800 (seconds)
      TLS session ticket:
      0000 - 6e 26 64 bb c3 97 30 9c-32 6f c5 38 d6 db 23 54   n&amp;d...0.2o.8..#T
      0010 - 65 43 b8 01 4e 46 5b b3-81 7e 26 6b 3a 36 2b 62   eC..NF[..~&amp;k:6+b
      0020 - 03 96 44 de 3d b0 81 be-18 b0 14 a1 09 99 28 73   ..D.=.........(s
      0030 - 2d 5a 87 6c b9 26 64 94-af f2 5e f1 f4 10 ba ff   -Z.l.&amp;d...^.....
      0040 - 68 a0 6a 31 d6 10 f8 88-61 63 5a 58 0b 1d d0 98   h.j1....acZX....
      0050 - 81 ed f7 45 11 1d 4a 22-23 2f 44 0c 62 b4 18 e9   ...E..J"#/D.b...
      0060 - e7 4a 57 10 f1 3c a0 d6-ee 46 98 5d df e9 a5 52   .JW..&lt;...F.]...R
      0070 - a6 75 da a6 25 89 87 f0-b0 ec 60 0d c0 19 0e 6f   .u..%.....`....o
      0080 - 23 53 a2 f2 18 e8 8d 51-28 e7 f2 d3 52 8a 02 f4   #S.....Q(...R...
      0090 - 32 aa 82 db                                       2...
  
      Start Time: 1342180574
      Timeout   : 300 (sec)
      Verify return code: 0 (ok)
  ---
  DONE 
  </code></pre>