Can't reach a certain website at my site? DNS issue?

I can't reach a certain website named It's an MSP of ours and I need access to the site. I can reach them when I am not at the main site. it seems to be a DNS issue with our DNS servers but I can't see to figure out why i can't reach the site via our DNS servers. What should I check in DNS? when I use NSlookup and type in it times out. My DNS server's LAN adapter's Primary DNS server is it's own IP address and the secondary is the Secondary DNS server in my company.
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The servers authoritative for that name are ns5 and, neither one of those is answering direct queries for the name for me, and I can't ping them either.

Unfortunately both of those servers are in the same subnet (.67 and .68), so any connectivity issues affect both nameservers and knock them offline. Have you called them to find out if they're having problems?

The reason you can most likey resolve their name from off your work lan, is because the name is probably cached at your ISP or somewhere else, while at work your servers have to resolve the name themselves.

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