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could not resolve host error

yelenak wrote on 2016-11-10:
Hello. We r using your services on daily basis. Starting today we get this error:
Fatal error: Uncaught [6] Could not resolve host: thrown in ......\pdfcrowd.php on line 447
Please help
support wrote on 2016-11-11:

This error message indicates a failure to resolve to an IP address.

Possible causes may be a lack of network/internet connectivity, a DNS resolver misconfiguration, a firewall, or there is another restriction issue.

We would recommend that you contact your network administrator or ISP to see if they're able to troubleshoot the problem.