Network active, unable 2 establish a connection to internet, email, servers

For the last few months, I've had connection issues with my Mac Pro at work. Tech support (pc guys) have been unable to figure out the issue and attribute it to the network.
The ethernet connection is active and it sometimes works. The connections to our shared drive works most of the time. The email (via microsoft exchange server) works 50/50 and the internet browsers have the sketchiest connectivity.
A PC laptop connected to the same port has no issues. Other MAC users in this building are having the same issues but rely on the wireless connection when their ethernet is interrupted. I don't have an airport card on mine.
Other MACs on campus do not have any connectivity issues.
Please help!

It might not be DNS...
My MacPro has recently in the last several months just had period stoppages of Ethernet1.
I've been hassling with network stuff on my internet connection but twice today my MacPro just stopped talking. I can ping somethings but not others and Safari refuses to connect to anything. Email doesn't work etc.
The only thing I can sort of attribute it to and I might try is is that I have both a secure and unsecure network. My virus barrier stuff refused to work through my firewall so I setup the unsecure network on Ethernet2. Since doing that it is sort of like it just gets confused.
If I reboot the MacPro everything comes back alive just fine and when it is stopped if I switch over to my son's MacMini it is fine so I know its not my network or cable modem.
So I don't know if you have both ethernet connections plugged in, in your MacPro but I do and I'm going to try moving the unsecure one to see if the problem gets better.
When the problem happens its very difficult to fix. Only a reboot seems to cure it. I've disabled the Ethernet1 and reenabled it, unplugged, replugged the cable, etc... It just seems to totally die.
Hopefully disconnecting Ethernet2 will do the trick.
M

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