I'm running libvirt-php 0.5.2 on CentOS 7 with libvirt 2.1.0. Using virsh I'm able to connect to hyper-v hosts correctly but using libvirt-php it fails during authentication since it seems that the credentials are not being passed along. This is the php code I'm using: <?php $logfile = 'test.log'; unlink($logfile); if (!libvirt_logfile_set($logfile)) die('Cannot set the log file'); $connstr = 'hyperv://user@hyperv-host/?transport=http'; $credentials = array(VIR_CRED_AUTHNAME=>'Administrator',VIR_CRED_PASSPHRASE=>'somepass'); $conn = libvirt_connect($connstr, false, $credentials); echo libvirt_get_last_error(); unset($conn); $fp = fopen($logfile, 'r'); $str = fread($fp, filesize($logfile)); fclose($fp); echo '<pre>'; echo $str; print_r($credentials); echo '</pre>'; ?> And this is the output: authentication failed: Password request failed [2016-09-02 11:10:02 libvirt-php/core ]: libvirt_connect: Found 0 elements for credentials [2016-09-02 11:10:02 libvirt-php/core ]: libvirt_virConnectAuthCallback: cred 0, type 5, prompt Enter Administrator's password for hyperv-host challenge hyperv-host [2016-09-02 11:10:02 libvirt-php/core ]: libvirt_virConnectAuthCallback: result (null) (0) [2016-09-02 11:10:02 libvirt-php/core ]: libvirt_connect: Cannot establish connection to hyperv://Administrator@hyperv-host/?transport=http Array ( [2] => Administrator [5] => somepass ) Note the "Found 0 elements for credentials". After doing some googling I found an email thread "[libvirt] [libvirt-php PATCH 0/3] Fix PHP5 compatibilty issues." that I think is related to my problem, especially patch 2/3. I also checked github project and saw that those patches are already merged in the code so I went ahead and apply them to 0.5.2 source code and rebuild: use VIRT_FOREACH macros everywhere - Commit: f4b760d libvirt_connect: use loop macros to read cred info - Commit: d704106 Define macros for looping php hash tables - Commit: 673a0bf The build went fine but now when I'm trying to connect to the hyper-v host using libvirt-php I get an internal server error (500) so it seems PHP is crashing. From the system log I see: kernel: traps: php-cgi[43452] general protection ip:7f63907f74a0 sp:7fff12d61f68 error:0 in libvirt.so.0.2001.0[7f6390735000+385000] Is there any other patch that I'm missing? Any ideas on how to fix the libvirt_connect credentials issue without applying the patches above? Sofware versions: OS: CentOS Linux release 7.2.1511 (Core) Kernel: 3.10.0-327.28.2.el7.x86_64 PHP: 5.4.16-36.3.el7_2.x86_64 libvirt: 2.1.0-4.1.x86_64 libvirt-php: 0.5.2 Thanks in advance for your replies. Fer