From: jndockery at gmail dot com
Operating system: Ubuntu 14.04.5 LTS
PHP version: 5.6.30
Package: Network related
Bug Type: Bug
Bug description:DNS Resolution appears broken with recent Ubuntu update
Description:
------------
After an automated update, PHP appears unable to resolve DNS entries
- Other commands still resolve properly: ping, telnet, ldapsearch,
curl
- Affected 3 services on separate servers
- Servers without unattended-upgrades (updated 2017-03-17) still
functioning
- Adding a manual entry in /etc/hosts allows DNS resolution
Affected service examples:
- ldap_bind(): "Can't contact LDAP server"
- PHP curl: "Could not resolve host: ..."
- SMTP: "Connection could not be established with host
smtp.sendgrid.net"
Packages recently updated:
- libgnutls-openssl27:amd64
- multiarch-support:amd64
- libfreetype6:amd64
- libc-dev-bin:amd64
- libc-bin:amd64
- libc6:amd64
- libgnutls26:amd64
- libc6-dev:amd64
Start-Date: 2017-03-21 06:31:17
Upgrade: libgnutls-openssl27:amd64 (2.12.23-12ubuntu2.6,
2.12.23-12ubuntu2.7), multiarch-support:amd64 (2.19-0ubuntu6.9,
2.19-0ubuntu6.10), libfreetype6:amd64 (2.5.2-1ubuntu2.5,
2.5.2-1ubuntu2.6), libc-dev-bin:amd64 (2.19-0ubuntu6.9,
2.19-0ubuntu6.10), libc-bin:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10),
libc6:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10), libgnutls26:amd64
(2.12.23-12ubuntu2.6, 2.12.23-12ubuntu2.7), libc6-dev:amd64
(2.19-0ubuntu6.9, 2.19-0ubuntu6.10)
End-Date: 2017-03-21 06:31:22
Thank you!
Test script:
---------------
<?
$url = "http://$_SERVER[HTTP_HOST]";
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$url);
curl_exec($ch);
print_r(curl_error($ch));
curl_close($ch);
Expected result:
----------------
no output
Actual result:
--------------
Could not resolve host: example.example.com
--
Edit bug report at https://bugs.php.net/bug.php?id=74287&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=74287&r=trysnapshot54
Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=74287&r=trysnapshot55
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=74287&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=74287&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=74287&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=74287&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=74287&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=74287&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=74287&r=support
Expected behavior: https://bugs.php.net/fix.php?id=74287&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=74287&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=74287&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=74287&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=74287&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=74287&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=74287&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=74287&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=74287&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=74287&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=74287&r=mysqlcfg