Resolved PHP-FPM CURL and HTTPS = Cannot resolve host

[Matt_Hill]

After a few hours CURL doesn't seem to be able to resolve URL's to HTTPS hosts.

Currently using PHP-FPM 5.5.38 and 7.0.17 on different websites, both with the same issue.

• The site on PHP 5.5.38 is Magento based and can't resolve live.sagepay.com to process payments
• The site on PHP 7.0.17 is Wordpress based and it can't resolve to update plugins.

When CURL can't resolve the hostname I can do via the terminal over SSH perfectly fine however.

If i reboot the server everything seems fine for the next 12+ hours.

What makes me think it might not be just a Plesk issue is various replies here: http://stackoverflow.com/questions/1341644/curl-and-https-cannot-resolve-host

Some are from people who have started to notice the same thing today / yesterday, however have previously had no issues / config changes for months, like myself.

I've added the following to my PHP configuration: curl_setopt($_h, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );

This has apparently resolved the issue for some, however too early to confirm if this has worked for myself. The server doesn't have any, IPV6 address, just multiple IPV4 addresses.

I thought it might be worth posting about to see if anyone else has had the same issue in the last day or two

OS: ‪Ubuntu 16.04.2 LTS
Plesk: Onyx 17.0.17 Update #20

 

[riddl]

Hey,

we do have exactly the same error since today/yesterday.


OS: ‪Ubuntu 14.04.5 LTS
Plesk: Onyx 17.0.17 Update #20

 

[IgorG]

can't resolve live.sagepay.com to process payments

Try to strace it with something like

# strace -o /tmp/curlissue -fF curl -v live.sagepay.com

and try to find something useful in /tmp/curlissue
Maybe there are some problems with opening libraries from /lib64/, SELinux, specific /root/.curlrc, /etc/nsswitch.conf or something else.

 

[UFHH01]

This is a (temporary) Ubuntu bug... pls. see as well: => https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1674776

( pls. wait for another security update for "libc-bin" and "libc6", which you should get with the manual command "aptitude upgrade" - On Ubuntu 16.04, the issue is already solved with new ( and old ) security updates. At the moment, I can't confirm it for Ubuntu 14.04, due to a missing test - server with this OS )

 

[trialotto]

@Everyone,

The following

Resolved - PHP 7.0.17 unable to resolve hostnames

might be of interest.

Regards......