Question

VPN users can't get to web.

Asked by: Go-GBS

This is sort of odd, b/c I swear it worked before, but when users VPN in and add the proxy settings to Internet Explorer, they can't get to the web.  When I check the logging it is referring to our Unrestricted Internet Rule and Allow Network Traffic rule, which in each case includes VPN users, but if you look at the Action it's Closed Connection.

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Asked On
2008-04-24 at 11:32:37ID23351395
Tags

Microsoft

,

ISA Server

,

2006

,

VPN users using Proxy

Topics

MS Forefront-ISA

,

Virtual Private Networking (VPN)

Participating Experts
1
Points
0
Comments
5

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Answers

 

by: Go-GBSPosted on 2008-04-24 at 11:50:01ID: 21433939

Let me add something, under logging when I get closed connection, it has my destination IP as our DNS servers, port 53, protocol DNS.  So is it that VPN users aren't getting to DNS?  I can remote into any servers and open my email through Outlook.

 

by: SlyDogPosted on 2008-04-27 at 21:17:25ID: 21451570

How are you assigning the VPN clients IP and DNS info? On the vpn client, does ipconfig show the proper information for the vpn connection? Once the vpn connection is established, are you able to nslookup internal and external?
Chances are, you're on the right track with a DNS issue. The rules for VPN clients will need to allow access to an internal DNS server as well as the obvious http/ftp etc rules to get to the Internet.
ISA also likes to assign VPN users the DNS server assigned to the ISA NIC, regardless of what the VPN config is set for. Make sure your ISA server has DNS setup and working for localhost before you try and figure out VPN DNS issues.

 

by: Go-GBSPosted on 2008-05-27 at 09:03:31ID: 21653038

When I check the Ipconfig I have the correct DNS servers listed from a VPN connection, as far as the localhost I think everything is configured properly for it.

 

by: SlyDogPosted on 2008-05-27 at 12:57:31ID: 21655119

It's important that you verify that localhost, internal clients and VPN client can all nslookup both internally and externally properly.
Are you manullay setting the proxy address?
Are you using an IP address or machine name for the proxy server?
Are you using DNS to set the proxy address?
Is the VPN client able to access the Internet without the proxy set?

 

by: Go-GBSPosted on 2008-06-04 at 05:48:43ID: 21709434

Seems we fixed the problem.  We had our old ISA server still online, but thought we had all traffic going through the new server, but once we shut it down VPN users could use the web with and without proxy.  So somehow the old server was causing problems.

20120131-EE-VQP-002

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