How to remove the error php_network_getaddresses: getaddrinfo failed: Name or service not known?

Question

Sphinx

The site uses the Sphinx search engine.
If you use a search on the site domain.ru (without www), then it works, but if www.domain.ru it gives an error connection to :9312 failed (errno=0, msg=php_network_getaddresses: getaddrinfo failed: Name or service not known)
This server is also DNS. Both records resolve normally. The site works fine both with www and without.
Console search also works.

Answer 1

well, you are from the server, then check in the same php

Answer 2

In short, everything was decided by changing the PHP version from 5.4 to 5.3