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VPN clients not able to resolve DNS names of local objects

Posted on 2014-01-19
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Last Modified: 2014-02-04
Hi Team

We have an issue on a client site where users could VPN to the local server but would not be able to gain access to resources.

The IP addresses given to users were in the 169.x.x.x range so that it appeared that RAS cannot pulled addresses from the DHCP range. We resolved this issue by creating a static address pull for the VPN users to access.

Now the users can login and access resources but only if they are accessed using IP values rather than local hostnames.

Looking for direction on now to enable users to access with hostname ?

Thanks
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Question by:optimus_nz
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Expert Comment

by:piyushranusri
ID: 39793354
VPN clients will not be able to resolve DNS host names on the internal network if they are not assigned a DNS server address by the ISA Server firewall/VPN server. In most cases, the VPN client already has a DNS server address assigned to it. However, that DNS server address does not resolve names on the corporate network because that DNS server is intended to resolve names on the network the VPN client computer is attached to before connecting to the ISA firewall/VPN server, or to resolve only Internet host names.
what is vpn server version ??

didi you review RAS configuration ?

The Routing and Remote Access service is configured to permit incoming connections.

did this happen suddenly or from starting its like that ?

hope tthis link will assist you to understand the cause..


please share the output
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LVL 11

Expert Comment

by:Manjunath Sullad
ID: 39793909
Try adding DNS suffix at client side.

On Local Area Network Icon, Properties,click Internet Protocol Version 4 (TCP/IPv4), click Properties.

Click Advanced, and then click the DNS tab.

Specify the DNS suffix for the connection, Ok.

Now try connecting VPN and check.

Refer below URL for further troubleshooting, based on error messages.

http://technet.microsoft.com/en-us/library/cc772616(WS.10).aspx#BKMK_5
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Expert Comment

by:vivigatt
ID: 39795437
If your VPN clients needs to be able to connect to local devices, they must "know" local name servers (DNS and potentially WINS).
This would be easier if the IP config was set by DHCP, but I think I remember that you can set it even with a "static" pool.
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Author Comment

by:optimus_nz
ID: 39801946
Hey Guys

The server is Windows server 2008, no ISA but there is a Mako modem/firewall which is the outbound connection for the site.

I have gone through and checked the settings for another site that has exactly the same setup (static IP pool for VPN and same model modem/firewall) and it is able to resolve hostnames local

Help ?
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Expert Comment

by:vivigatt
ID: 39805433
HAve you checked DNS and WINS settings ?
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Accepted Solution

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optimus_nz earned 0 total points
ID: 39822230
Hi Team

We were not able to resolve in a timely fashion so we change the login scripts to reference IP rather than hostname for drive mappings.

We were not able to identify the cause but the VPN was not able to provide DHCP address to users so assume this is somehow related to users not being able to resolve DNS/Hostname either?

In anycase we would like to close the ticket
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Author Closing Comment

by:optimus_nz
ID: 39832006
Nothing suggested was able to resolve the issue. Would like to close thread
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