I am getting the above error when trying to set up email fetching.I am running Ubuntu 16-04.2 LTS with PHP Version 5.6 with Apache2 connecting to a Microsoft Exchange 2010 server.I have enabled IMAP and added the IP of the OSTickets VM to the allowed list for IMAP on exchange as well and the IMAP service is running.I can send mail via telnet from the OSTickets VM as well.Please let me know if there is anymore information that I can add to assist with troubleshooting this.PHP logging appears to be enable but I am not seeing anything relevant in there.Here is the error_log; AH00489: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2' AH00491: caught SIGTERM, shutting down AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2' AH00169: caught SIGTERM, shutting down AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2' AH00169: caught SIGTERM, shutting down AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2' AH00169: caught SIGTERM, shutting down AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2' AH00171: Graceful restart requested, doing restartAH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2' AH00171: Graceful restart requested, doing restartAH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2' AH00171: Graceful restart requested, doing restartAH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2' AH00169: caught SIGTERM, shutting downPHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20131226/php_intl.dll' - /usr/lib/php/20131226/php_intl.dll: cannot open shared object file: No such file or directory in Unknown on line 0 AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2' PHP Warning: stream_socket_client(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /var/www/html/include/pear/N$ PHP Stack trace:, referer: http://tickets/scp/emails.php?a=add PHP 1. {main}() /var/www/html/scp/emails.php, referer: http://tickets/scp/emails.php?a=add PHP 2. Email->update() /var/www/html/scp/emails.php, referer: http://tickets/scp/emails.php?a=add PHP 3. Mail_smtp->connect() /var/www/html/include/class.email.php, referer: http://tickets/scp/emails.php?a=add PHP 4. Mail_smtp->getSMTPObject() /var/www/html/include/pear/Mail/smtp.php, referer: http://tickets/scp/emails.php?a=add PHP 5. Net_SMTP->connect() /var/www/html/include/pear/Mail/smtp.php, referer: http://tickets/scp/emails.php?a=add PHP 6. Net_Socket->connect() /var/www/html/include/pear/Net/SMTP.php, referer: http://tickets/scp/emails.php?a=add PHP 7. stream_socket_client() /var/www/html/include/pear/Net/Socket.php, referer: http://tickets/scp/emails.php?a=add PHP Warning: stream_socket_client(): unable to connect to tiger (php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution)$ PHP Stack trace:, referer: http://tickets/scp/emails.php?a=add PHP 1. {main}() /var/www/html/scp/emails.php, referer: http://tickets/scp/emails.php?a=add PHP 2. Email->update() /var/www/html/scp/emails.php, referer: http://tickets/scp/emails.php?a=add PHP 3. Mail_smtp->connect() /var/www/html/include/class.email.php, referer: http://ickets/scp/emails.php?a=add PHP 4. Mail_smtp->getSMTPObject() /var/www/html/include/pear/Mail/smtp.php, referer: http://tickets/scp/emails.php?a=add PHP 5. Net_SMTP->connect() /var/www/html/include/pear/Mail/smtp.php, referer: http://tickets/scp/emails.php?a=add PHP 6. Net_Socket->connect() /var/www/html/include/pear/Net/SMTP.php, referer: http://tickets/scp/emails.php?a=add PHP 7. stream_socket_client() /var/www/html/include/pear/Net/Socket.php, referer: http://tickets/scp/emails.php?a=add AH00169: caught SIGTERM, shutting downPHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20131226/php_intl.dll' - /usr/lib/php/20131226/php_intl.dll: cannot open shared object file: No such file or directory in Unknown on line 0 AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2'