Question

Can't authenticate to SBS2003 via Site to Site VPN

Asked by: narf23

I have a site to site VPN between two offices - the head office is running Windows Small Business Server 2003 and the branch office has 1 Windows XP PC. There is a Billion BiPAC 7402R2 VPN Router at both sites running an IPSec VPN connection.

Head Office IP range 10.4.68.x
Remote Office IP Range 192.168.3.x

The problem is that the PC does not allow mapping onto the SBS2003 Server with UNC paths (i.e. Can't map to \\SBSServer\Share) but I can map using the Servers IP Address (i.e. \\192.168.1.2\Share) - the accounting package software that is installed on the server requires a UNC path to run on the XP PC on the remote office. I basically recieve an error that there is no Authentication to the Domain Contoller, please contact your administrator.

I am able to ping devices between both office (i.e. Can ping server from XP PC using server name or IP address and can ping the XP PC from the Server). I am also able to remote via RDP into the Server.

I have tried the following...
1. Disabling Firewall via GPO on the desktop (but only replicated onto the desktop PC once I brought the PC to the head office and logged on...)
2. Disabled the firewall on both routers (thinking ports were being blocked to the Server)
3. Enabled RIP Listner on the XP PC (thinking it was a routing problem)

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Asked On
2008-04-22 at 05:51:32ID23342684
Tags

Microsoft

,

Small Business Server

,

2003

,

Billion

,

BiPAC

,

7402R2

,

VPN Router

Topics

SBS Small Business Server

,

Virtual Private Networking (VPN)

,

Network Routers

Participating Experts
2
Points
250
Comments
4

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Answers

 

by: Jaymz_RPosted on 2008-04-22 at 06:02:52ID: 21410640

This is a quick fix around this problem, considering you only have one XP remote pc.  open up your "hosts" file located in "C:\WINDOWS\system32\drivers\etc" and edit it with notepad.  and add a new line that has the following combination

10.4.68.x       Servername

The problem lies with DNS.  If you were to setup on the router, the second DNS server being the other sites router, that could fix the problem.  but the above should work fine.

 

by: RobWillPosted on 2008-04-22 at 07:11:12ID: 21411247

The remote site PC's should point ONLY to the SBS for DNS name resolution, the ISP or router should not be added, not even as an alternate/secondary. Yes, this means if the SBS or VPN is down local users cannot access the Internet, but it is necessary in a Microsoft world. A local DC would resolve that issue if it is possible, but it is not necessary so long as the remote site is accessible.

The other thing you need to do is add the SBS domain suffix to the remote PC's DNS tab, in the "DNS suffix for this connection" box, under advanced TCP/IP properties of the network adapter.

Once done, on the PC run  ipconfig /flushdns  at a command line or reboot.

 

by: narf23Posted on 2008-04-23 at 23:27:24ID: 21428142

After adding the SBS IP as the DNS in the Router's DHCP details - I am able to map network drives.

Thanks for the solution.

 

by: RobWillPosted on 2008-04-24 at 02:20:41ID: 21428886

Thanks narf23.
Cheers !
--Rob

20120131-EE-VQP-002

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