Help with VPN and Exchange!!!

[vargas71]

Hi,


Right now I'm configuring VPN on a Cisco PIX 506E...everything work fine when connected...

I can see the personnal drives, I can print on the local printer etc...

But I can't connect to the Microsoft Exchange 2000 Server...

I received that message like error...

"Unable to open your default e-mail folders. The Microsoft Exchange Server computer is not available. Either there ara network problems or the Microsoft Exchange Server computer is down for maintenance."

The funniest thing is that when I'm configure Outlook 2000 or 2002(XP) it can check the name of the user I'm entering on the Exchange server but can't find and open my folders???...And, everything else of exchange works, pop, smtp, imap, web etc

So why does the Exchange Server can't work???

Can anyone help me???

 

[bunnyweb]

Hi vargas71,

We were having the same problem with our Exchange server not that long ago.

Our problem was with name resolution. We were referencing our Exchange server with a name ("DUBSRV&quot but our firewall could only recognize IP addresses. We added the IP address of our Exchange server to our firewall DHCP relay which allowed the firewall to send DHCP requests to our server.

I'm still fairly new to networking and VPN and firewalls and all that fun stuff, so I'm not positive this even relates to your problem. But hopefully it might point you in the right direction.

Rachel

 

[twynstra]

Hi Vargas71,

We had that problem too. I added a line to the lmhosts file in C:\windows\system32\drivers\etc of the computer for our exchange server

ipnumber name of server #PRE

 

[RobNS]

And another suggestion.. had the same problem, and found that it came down to fragmented packets... had to change the MTU value on the network adaptor that I was connecting over from default (1458) down to ~1300 - smaller packets, casuses more traffic, but fixed the problem for me and around a dozen of my users.

I was able to ping hosts, launch other applications, but the main thing I couldnt do was Exchange... since lowering the MTU Ive had nothing but success...

If you search for an mtu tweaker you should find a tool, or I can track the registry changes if you want them

 

[Hanson]

Go to the Exchange properties and change the logon network security from NT Password Auth to None. This will force a separate login screen.