Outlook slower when using OpenDNS

I am using OpenDNS and when I use it, it slows down my Outlook.  My outlook access a public exchange server.  

Why is it slower and how can i speed it up?
al4629740Asked:
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Suliman Abu KharroubIT Consultant Commented:
work around:

add your public exchange server IP address and host name to the hosts file:

C:\windows\system32\drivers\etc\
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al4629740Author Commented:
Why would that make it load faster?
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al4629740Author Commented:
still not working faster.  It is very slow
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Suliman Abu KharroubIT Consultant Commented:
emmmmm,

if you dont use OpenDns, does outlook immediately go faster... ?
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al4629740Author Commented:
Yes
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al4629740Author Commented:
It immediately loads withourt opendns
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Suliman Abu KharroubIT Consultant Commented:
issue "nslookup your_public_exchange_name "while you are using opendns and another time while you are using your ISP dns.

Start-->run-->cmd

ex: nslookup your_public_exchange_name

does the results identical ?

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al4629740Author Commented:
On the network where the issue is I get the following message:



*** Can't find server name for address 192.168.254.9: Non-existent domain
*** Default servers are not available
Server:  UnKnown
Address:  x.x.x.x

Name:    nameofserver
Address:  x.x.x.x

Open in new window

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Suliman Abu KharroubIT Consultant Commented:
192.168.254.9 is not a public IP. so i assume your exchange server is hosted internally.

so, you just have to add the ip address and the hostname on the hosts file as maintained above.

then issue the command :

ipconfig /flushdns --> to flush the dns cache entries.

** there is a " tab" not a "space" separated between the ip address and the hostname ( it is important )
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al4629740Author Commented:
The Exchange Server is public...

When I do an nslookup, it is trying to resolve the name of our local DNS server on our network.
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