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"The server is unavailable" accessing exchange 2003 via vpn using outlook 2k7 or 2k10.

Posted on 2010-09-22
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Last Modified: 2012-05-10
Using two way vpn connections (sonicwall to sonicwall). I am able to ping exchnage and map drives to network. Outlook accepts the exchange account (confirms account name/resolves exchange server name) upon creation, but when I try to launch outlook I get "The server is unavailable". All ip-to-host name entries in local host file for the remote network are present and correct. Can someone please help me resolve this?

Thanks,
Evan
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Question by:ekitech
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Expert Comment

by:darrylka
ID: 33736806
Are you trying to use (RPC) over HTTP?
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Author Comment

by:ekitech
ID: 33736949
Thanks for your reply darrylka. Is that OWA? I'm not familliar with RPC over HTTP.
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Expert Comment

by:darrylka
ID: 33736987
RPC over HTTP allows remote Outlook users to connect to an Exchange Server (Exchange 2003 and above) over an HTTP connection without the need for a VPN connection.  It's how Exchange became a hostable solution.
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Expert Comment

by:FDiskWizard
ID: 33737010
Sounds like your firewall is blocking Exchange <> Outlook traffic. Can you check your logs?
See this for list of ports used:
http://technet.microsoft.com/en-us/library/bb124075(EXCHG.65).aspx

Also try simply browsing to the exchange server.
\\Exchange_server\

Maybe it is a DNS/WINS issue.
But since you said you pinged it (by name?) probably not - unless the name is resolving to the wrong IP.

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Author Comment

by:ekitech
ID: 33737012
really, can you direct me to a link that will help me set that up? Does it use the OWA URL as the smtp and pop servers?
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Author Comment

by:ekitech
ID: 33737110
Firewall was turned off. I am able to access the server via \\Exchange_server\. DNS is ok.
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Expert Comment

by:FDiskWizard
ID: 33737166
Maybe you're running into an MTU issue.
Try this... an MTU tweak that has helped us with some Outlook clients in the past.
http://support.microsoft.com/kb/315008
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Author Comment

by:ekitech
ID: 33737286
Thanks FDiskWiz. I'm running Windows 7 Enterprise. Your link is for xp.
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Expert Comment

by:darrylka
ID: 33737359
Yes, it uses the OWA URL.  Here's an excellent article about how to set it up:

http://www.msexchange.org/tutorials/Implementing-RPC-over-HTTPS-single-Exchange-Server-2003-environment.html
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LVL 15

Expert Comment

by:JBond2010
ID: 33737586
Setting up RPC/HTTP is not neccessary as you have a VPN in place.

>>Configured lower mtu, is that 1500 ? Have you tried with 1300 ?

Try this below first;

1. Lower the mtu on the remote computer (choose one, again the end computer and not the gateway) to be 1300

How to do this? Google Dr.tcp and get the tiny tool. Use that to set the mtu on the machine to 1300 to the correct adaptor.

2. Then go to 'hosts' file Windows\System32\Drivers\etc, make a static entry for this server.

See if that helps.

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Expert Comment

by:FDiskWizard
ID: 33737825
Ah, you're right.. people are saying that reg tweak doesn't work in Vista/Windows7
Now you can do it via NETSH
netsh interface ipv4 set subinterface "Local Area Connection" mtu=nnnn store=persistent
Follow the numbers in that article and try those values in place of nnnn
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Author Comment

by:ekitech
ID: 33738340
ID:33737359 Author:darrylka - Figure 5 in your link calls for changing data in registry key (see attached). I tried this key with: MyExchangeServerName.MyDomain.com as shown in the attached image and it didn't work, should this be the OWA URL instead? webmail.MyDomain.com (this info is also required in Fig. 8 (see attached) in your link)

BTW I'm using Outlook 2010, Exchange 2003 Ent. I have also used Outlook 2007 with same problem

Tried MTU without success and HOST file already has entry for exchange server/all servers.
Figure-2051156860528218-1-.jpg
image0161156762532484-1-.jpg
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Accepted Solution

by:
JBond2010 earned 500 total points
ID: 33740242
Follow this link and see does it help. It applies to Outlook 2007 & Outlook 2010.

http://support.microsoft.com/kb/913843
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Author Closing Comment

by:ekitech
ID: 33887786
Don't know if this is the solution or not. Been too busy to work on it but thanks.
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