Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium


VPN - problem accessing network work drives on corporate network after establishing vpn connection.

Posted on 2008-11-17
Medium Priority
Last Modified: 2012-05-05
We are using a cisco client (ver vpn to access our corporate network.  For some reason when users connect to the corporate network through the vpn they sometimes can not access the network drives or email.  The strange thing is some users can access all network drives from their cable modems from home, but not from hotels or vise versa.  There is never a problem establishing the vpn connection (this always works in all cases). Once they are connected they just can't access the corp network.
How is it possible that one minute they can access the drive and other times they can't?  Is it the vpn client software?  We have tried wireless & and wired connections as well as broadband cards.  It's normally a hit or miss!  If this is not clear please let me know....
Question by:eblogix
LVL 78

Expert Comment

by:Rob Williams
ID: 22980079
Is there any chance the Corporate site is using a common subnet like 192.168.0.x, 192.168.1.x, 10.0.0.x?
If the office subnet and client's local subnet are the same you can experience this problem

Accepted Solution

lausengdn earned 2000 total points
ID: 22980172
That is frequently caused by a router somewhere that has it's MTU packet size set too low.
They call it a Black Hole Router.

Microsoft has a article explaining this here:

Here is a another good explanation from Cisco.
They have a link to a utility called Dr TCP that will help configure your Network card and set the MTU setting.

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Tired of waiting for your show or movie to load?  Are buffering issues a constant problem with your internet connection?  Check this article out to see if these simple adjustments are the solution for you.
Let’s list some of the technologies that enable smooth teleworking. 
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question