Excahnge 2010 - 2 nics problems with DNS and users connectivity

Hi  There,
I have virtualised exchange 2010 with one nic facing outwards (3) to firewall and one facing inwards to users. Exchange is reporting errors with DNS "MSExchange ADAccess 2501"

If i ping the host name from a user machine,  I get the external IP address. If I ping the internal IP address I get a suitable response.

Users are having intermittent conection problems with Outlook connecting to exchange and staying connected.

Any ideas?
thansk
Fridge61Asked:
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SandeshdubeySenior Server EngineerCommented:
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Fridge61Author Commented:
Thanks for that. do i need to reboot for windows to recognize the change?
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SandeshdubeySenior Server EngineerCommented:
After setting the correct dns setting run ipconfig /flushdns and ipconfig /registerdns or you can also plan to reboot the server once.
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Fridge61Author Commented:
thanks very much - that seems to have resolved the issue
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