We are having something very strange happening here. 3 or 4 times over the last 2 weeks we keep completely losing access to the majority of websites ending in a .co.uk domain name.
All sites under .com/.net or any other combination are fine - but not .co.uk
Strange thing is it doesnt completely remove access to ALL .co.uk - we can still get to our host 1&1.co.uk for instance but the majority of sites are unreachable. They simply time out with an error message that the site cannot be reached.
I figured DNS must be the issue, i have flushed DNS both on my servers and workstations - including my DNS servers, i have restarted all related routers to force them to resynch with my isp. This has not helped and the issue is affecting every user in the business.
NSLOOKUP also times out when trying to contact the websites in question. I cannot ping them either.This has really got me stumped. Any ideas?