This is well known problem with RHEL 6 based systems and can be fixed by adding the following line to /etc/resolv.conf
Save and close the file. This should fix the problem as the resolver uses the same socket for the A and AAAA requests. Turning this option on changes this behavior so that if two requests from the same port are not handled correctly it will close the socket and open a new one before sending the second request[1].
options single-request-reopen
References:
- [1] This solution is documented RHN KB ID # 58626 (Red hat subscription required)
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