PHP error after server move and new IP

[sc00zy]

Last friday our server was moved to another datacenter and got new ip-addresses. Since then I get this error on payment pages on a couple of webshops.

Warning:  fsockopen() [function.fsockopen]: php_network_getaddresses: getaddrinfo failed: Name or service not known in /home/username/public_html/administrator/components/com_virtuemart/classes/payment/ideal/ThinMPI.php on line 77

Warning:  fsockopen() [function.fsockopen]: unable to connect to ssl://ideal.rabobank.nl:443 (php_network_getaddresses: getaddrinfo failed: Name or service not known) in /home/username/public_html/administrator/components/com_virtuemart/classes/payment/ideal/ThinMPI.php on line 77

I guess this has something to do with the ip changes? I read something about nameservers not being resolved right?

What should I check?

Thanks in advance!

[sc00zy]

My sysadmin solved it allready!

Right after I posted my question here. It turned out the wrong resolvers were setup.