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1. Encountering Issues with Cisco 3000 VPN Client Installation
Simply disable Internet Connection Sharing mode on the device. To deactivate this mode, navigate to Start ->Control Panel ->Administrative Tools ->Services ->Internet Connection Sharing and then uncheck Load On Startup.
Upon completing the aforementioned steps, the welcome screen for users on Windows XP and Fast User Switching will also be disabled. However, the old standby mode using Ctrl + Alt + Del key combination still functions normally.
If you need to utilize Fast User Switching, you can disable the Start Before Login feature, but only do so when Fast User Switching activation is truly necessary.
Cisco advises their users against installing multiple VPN clients on the same personal computer. If encountering issues during Cisco VPN Client installation, try removing other VPN Clients.
2. Encountering Errors when Attempting to Connect to VPN
You need to open certain ports on firewall software such as Zone Alarm, Symantec, etc. Hence, you can open the following ports to resolve errors when attempting to connect to VPN:
- UDP ports 500, 1000, and 10000
- IP protocol 50 (ESP)
- TCP IPSec/TCP
- NET-T port 4500
You can also customize IPSec/UDP and IPSec/TCP ports. After performing these actions on your computer, ensure that these ports are also opened on the client machine.
This often occurs when split-tunneling mode is disabled. While this mode poses some security risks that users need to disable, you can also implement some security measures to mitigate them. On PIX, use the following command line to activate split-tunneling:
Utilize the command vpngroup vpngroupname split-tunnel split_tunnel_acl when configuring your VPN.
Ensure proper access control by setting up a command list to determine split tunneling traffic flow. For instance, use access-list split_tunnel_acl permit ip [IP range] to grant access to specified IP ranges for your VPN.
When using the Cisco Series 3000 VPN Concentrator, configure encrypted networks for split tunneling. Navigate to Configuration -> User Management -> Base Group, select Only Tunnel Networks In The List, create a network list to monitor, and choose this list from the Split Tunneling Network List dropdown menu.
4. Client IP range overlapping with VPN server
Upgrade the firmware of your Linksys BEFW11S4 to version 1.44 or higher.
Update Asante FR3004 Cable/DSL Routers firmware to version 2.15 or above.
Replace your Nexland Cable/DSL Routers with ISB2LAN code with a newer model.
If the aforementioned methods fail, consider replacing your router with a newer generation one.
6. Experiencing connection drops while setting up connection on the client machine.
In this scenario, users may encounter an error message VPN Connection terminated locally by the Client. Reason 403: Unable to contact the security gateway. There are three reasons behind this error:
1. Incorrect group password entered by the user.
2. Incorrect VPN IP address entered by the user.
3. Users encounter various internet connection issues on their devices.
Check client logs by clicking on Log and enabling this feature, then review errors containing Hash Verification Failed.
7. Facing VPN connection setup issues with NAT devices
This issue may arise on Cisco VPN hardware devices due to how IPSec operated before standards allowed for packet header modification during data transmission. To resolve this issue, enable NAT-Traversal (NAT-T) on your device and open UDP port 4500 on the firewall.
If you're using PIX firewall, open port 4500 and enable Nat-Traversal feature with command isakmp nat-traversal 20 (where 20 is the NAT hold time).
For those utilizing Ciscon VPN Concentrator and a separate firewall, open UDP port 4500 on the firewall and navigate to Configuration ->Tunneling and Security ->IPSec ->NAT Transparency then check the option IPSec over NAT-T.
8. Connection Drops After a While
Firstly, verify that the user's computer isn't falling into standby or hibernate mode, and screen saver isn't activated. Standby and Hibernate modes may disrupt your network connection when a VPN client connects to a VPN server. VPN users might have also set up network adapter to turn off after a certain period for power saving purposes.
If users are using Wi-Fi network, connection drops after a while may occur due to weak Wi-Fi signal, which decreases the connection speed on VPN. Or if users are using wired connection, perhaps the network cable quality is poor, issues with the router, or any other physical connection errors.
9. Computer Not Showing on Network, Even When VPN is Turned Off
This issue often arises when users activate the firewall pre-installed on the VPN Client. If the firewall is activated, it continues to run even when users turn off the VPN Client. To change this, open the client and from the options page, uncheck the firewall status.
10. Encountering Issues with Preshared Keys
If you encounter errors related to preshared keys, you may have mismatched keys at both ends of the VPN connection. To resolve this common VPN issue, go to Configuration ->System ->Tunneling Protocols ->IPSec LAN-to-LAN then select your IPsec configuration. In case of pre-shared keys, input your preconfigured key.
On Cisco PIX firewall, use the command isakmp assword address xx.xx.xx.xx netmask 255.255.255.255 where the password is the pre-shared key. The key you shared and PIX must match.
Here are 10 VPN errors and their fixes to help you address some common VPN connection issues on your devices. Hope this article will help you enhance your knowledge about VPN virtual network and quickly resolve some common issues when using VPN. If you don't know anything about VPN and want to learn about this virtual network system. Try creating a VPN Client using on Windows 7 for research.
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