Error 0x800704DD, Outlook 2007

Hi. I have a problem when users press the button "Send and Recieve" on MS Outlook 2007 clients, inmediatly shows the following error attached. I have a MS Exchange 2007 sp3 mail server. Do any of you could be to help me? Thanks in advance.
error-outlook.png
MicroinformaticaIBAsked:
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vmaganCommented:
What version of exchange are you using?

Is everyone having this issue?

This sounds like it could be a certificate issue.
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vmaganCommented:
Ok, i did some research and this error states that the user is not logged on to the network. Make sure who ever is having this issue is logged on to the network correctly.
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MicroinformaticaIBAuthor Commented:
Thanks for your feedback!
1-MS Exchange 2007 Standard Edition Service Pack 2 the last roll up is 8.
2-No, it isn't. Only one user experience had this problem.
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vmaganCommented:
Make sure they have full network connectivity. Try pinging the exchange server when they are connected. Pretty sure if they are still getting this error message that they cannot ping the exchange server or domain controller. If not, then check patch cables.
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MicroinformaticaIBAuthor Commented:
¿It's necessary have active ICMP echo in network for email clients?

This is the complete scenario (info about lan is only reference)

Desktop:
Windows 2003 server Terminal Server Session with MS Outlook 2007 SP3
LAN 192.168.240.4 MASK 255.255.255.0 GW 192.168.240.1 DNS 192.168.226.20
Ping OK to Domain, Ping no OK to MBX

MBX Server:
Windows 2003 Server MS exchange 2007 STD SP2 Rollup 8
LAN 192.168.226.21 MASK 255.255.255.0 GW 192.168.226.1 DNS 192.168.226.20

Domain:
Windows 2003 Server SP2
LAN 192.168.226.20 MASK 255.255.255.0 GW 192.168.226.1 DNS 192.168.226.20
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vmaganCommented:
No icmp isn't necessary. So a ping to domain is good and exchange no good. Do me a favor and ping exchange from another pc and let me know results
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MicroinformaticaIBAuthor Commented:
from my PC, first ping to EXG server, next ping to DC
ScreenshotPingFromPCtoServerEXGa.JPG
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vmaganCommented:
ok so no one can ping the exchange server. (it's a good thing i speak spanish) lol

Is there a DNS record for Exchange in DNS? I'm sure there is, but we want to make sure.

Not sure if you know how the network is setup, but is the Exchange server plugged in to the same switch that the DC is plugged in to?

I am wondering if anyone else is having outlook issues and you just might not be aware of it.

Does that one machine still receive emails if he/she doesnt click on send/receive? Or are they not receiving emails at all?
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MicroinformaticaIBAuthor Commented:
Dear friend, the issue has been resolved, thanks for everything. :)
I turned off Cached Exchange Mode and restart MS Outlook and I couldn't reproduce this issue again.
I think OAB have problem with her account. In this article refer about this:
http://office.microsoft.com/en-us/outlook-help/troubleshoot-cached-exchange-mode-HP001000078.aspx?CTT=1
brief summary:
-I can't turn on Cached Exchange Mode.
 -You have installed Microsoft Terminal Services.
Cached Exchange Mode uses an Offline Folder file (.ost) (Offline Folder file: The file on your hard disk that contains offline folders. The offline folder file has an .ost extension. You can create it automatically when you set up Outlook or when you first make a folder available offline.). These files cannot be used if you have installed Microsoft Terminal Services for Microsoft Windows 2000 Server or Windows Server 2003. Installation of Terminal Services Client or the Remote Desktop Connection client does not prevent access to this feature.

Greetings!
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