Cisco anyconnect проблемы с подключением

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Basic Troubleshooting on Cisco AnyConnect Secure Mobility Client Errors

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Objective

The objective of this document is to show you basic troubleshooting steps on some common errors on the Cisco AnyConnect Secure Mobility Client. When installing the Cisco AnyConnect Secure Mobility Client, errors may occur and troubleshooting may be needed for a successful setup.

Note that the errors discussed in this document is not an exhaustive list and varies with the configuration of the device used.

For additional information on AnyConnect licensing on the RV340 series routers, check out the article AnyConnect Licensing for the RV340 Series Routers.

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Basic Troubleshooting on Cisco AnyConnect Secure Mobility Client Errors

Note: Before attempting to troubleshoot, it is recommended to gather some important information first about your system that might be needed during the troubleshooting process. To learn how, click here.

1. Problem: Network Access Manager fails to recognize your wired adapter.

Solution: Try unplugging your network cable and reinserting it. If this does not work, you may have a link issue. The Network Access Manager may not be able to determine the correct link state of your adapter. Check the Connection Properties of your Network Interface Card (NIC) driver. You may have a «Wait for Link» option in the Advanced Panel. When the setting is On, the wired NIC driver initialization code waits for auto negotiation to complete and then determines if a link is present.

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2. Problem: When AnyConnect attempts to establish a connection, it authenticates successfully and builds the Secure Socket Layer (SSL)session, but then the AnyConnect client crashes in the vpndownloader if using Label-Switched Path (LSP) or NOD32 Antivirus.

Solution: Remove the Internet Monitor component in version 2.7 and upgrade to version 3.0 of ESET NOD32 AV.

3. Problem: If you are using an AT&T Dialer, the client operating system sometimes experiences a blue screen, which causes the creation of a mini dump file.

Solution: Upgrade to the latest 7.6.2 AT&T Global Network Client.

4. Problem: When using McAfee Firewall 5, a User Datagram Protocol (UDP)Datagram Transport Layer Security (DTLS) connection cannot be established.

Solution: In the McAfee Firewall central console, choose Advanced Tasks > Advanced options and Logging and uncheck the Block incoming fragments automatically check box in McAfee Firewall.

5. Problem: The connection fails due to lack of credentials.

Solution: The third-party load balancer has no insight into the load on the Adaptive Security Appliance (ASA) devices. Because the load balance functionality in the ASA is intelligent enough to evenly distribute the VPN load across the devices, using the internal ASA load balancing instead is recommended.

6. Problem: The AnyConnect client fails to download and produces the following error message:

Solution: Upload the patch update to version 1.2.1.38 to resolve all dll issues.

7. Problem: If you are using Bonjour Printing Services, the AnyConnect event logs indicate a failure to identify the IP forwarding table.

Solution: Disable the Bonjour Printing Service by typing net stop “bonjour service” at the command prompt. A new version of mDNSResponder (1.0.5.11) has been produced by Apple. To resolve this issue, a new version of Bonjour is bundled with iTunes and made available as a separate download from the Apple web site.

8. Problem: An error indicates that the version of TUN or network tunnel is already installed on this system and is incompatible with the AnyConnect client.

Solution: Uninstall the Viscosity OpenVPN Client.

9. Problem: If a Label-Switched Path (LSP) module is present on the client, a Winsock catalog conflict may occur.

Solution: Uninstall the LSP module.

10. Problem: If you are connecting with a Digital Subscriber Line (DSL) router, DTLS traffic may fail even if successfully negotiated.

Solution: Connect to a Linksys router with factory settings. This setting allows a stable DTLS session and no interruption in pings. Add a rule to allow DTLS return traffic.

11. Problem: When using AnyConnect on some Virtual Machine Network Service devices, performance issues have resulted.

Solution: Uncheck the binding for all IM devices within the AnyConnect virtual adapter. The application dsagent.exe resides in C:\Windows\System\dgagent. Although it does not appear in the process list, you can see it by opening sockets with TCPview (sysinternals). When you terminate this process, normal operation of AnyConnect returns.

12. Problem: You receive an “Unable to Proceed, Cannot Connect to the VPN Service” message. The VPN service for AnyConnect is not running.

Solution: Determine if another application conflicted with the service by going to the Windows Administration Tools then make sure that the Cisco AnyConnect VPN Agent is not running. If it is running and the error message still appears, another VPN application on the workstation may need to be disabled or even uninstalled. After taking that action, reboot, and repeat this step.

13. Problem: When Kaspersky 6.0.3 is installed (even if disabled), AnyConnect connections to the ASA fail right after CSTP state = CONNECTED. The following message appears:

Solution: Uninstall Kaspersky and refer to their forums for additional updates.

14. Problem: If you are using Routing and Remote Access Service (RRAS), the following termination error is returned to the event log when AnyConnect attempts to establish a connection to the host device:

Solution: Disable the RRAS service.

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15. Problem: If you are using a EVDO wireless card and Venturi driver while a client disconnect occurred, the event log reports the following:

Solutions:

  • Check the Application, System, and AnyConnect event logs for a relating disconnect event and determine if a NIC card reset was applied at the same time.
  • Ensure that the Venturi driver is up to date. Disable Use Rules Engine in the 6.7 version of the AT&T Communications Manager.

If you encounter other errors, contact the support center for your device.

For further information and community discussion on AnyConnect licensing updates, click here.

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Fix Cisco AnyConnect Not Working in 4 Quick and Easy Ways

The Cisco VPN solution is working rather nicely on Windows 10 if we look at the reports. The most prominent issues appear only after the major updates which tend to break the application.

These are not common, but then again, they seemingly render the VPN client completely unusable. At least that was the case with Fall Creators Update and April Update.

However, there’s no need to worry. We found some applicable steps and enlisted them below so make sure to check them out.

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Why is Cisco VPN not connecting?

Users report that an error message appears while trying to connect to the Cisco VPN Client.

When the VPN client is launched, an error message reads The necessary VPN sub-system is not available. You cannot connect to remote VPN server displays.

These three factors can cause this warning to appear:

  • The VPN client service has not yet been launched.
  • There are installation issues with the VPN Client, which can be caused by corrupted or duplicated files.
  • While launching the VPN client, a firewall or antivirus software may be interfering with the VPN connection.

A VPN client is more prone to lose Dead Peer Detection while it is having connectivity problems. If your system’s firmware is outdated, it could affect Dead Peer Detection.

Your VPN client will be less likely to lose Dead Peer Detection if you use a robust VPN connection. Older VPN servers are more vulnerable to Dead Peer Detection problems.

Why is Cisco AnyConnect not opening?

Common errors include Cisco AnyConnect VPN Login Failed, which can happen for a variety of reasons. The VPN client’s inability to connect to the VPN server is the most frequent cause of this problem. Incorrect VPN settings, firewall configuration, or problems with network connectivity are just a few causes of this.

By navigating to the Windows Administration Tools and making sure that the Cisco AnyConnect VPN Agent is not running, you can determine whether another program interfered with the service.

It might be necessary to disable or even uninstall another VPN application on the desktop if it is already operating and the error message still shows. Verify if you have more than one VPN service installed on your PC, this might be the core problem for Cisco AnyConnect not opening.

How do I fix the Cisco VPN issues on Windows 10?

1. Repair the installation

  1. In the Windows Search bar, type Control and open Control Panel.
  2. Click Uninstall a program in the bottom left corner.
  3. Click on the Cisco System VPN client and choose Repair.
  4. Follow the instructions until the installation is repaired.

Let’s start by repairing the installation. Lots of third-party applications tend to break after a major update is administered. That’s why it is always recommended to reinstall them after the update is installed.

Even better, if you want to avoid one of the numerous update/upgrade errors, uninstalling is a viable choice.

However, if you’ve not uninstalled Cisco VPN prior to an update, instead of reinstallation, you should try out repairing the present installation first.

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If you’re not sure how to repair the Cisco VPN, follow the steps we provided above.

2. Allow VPN to freely communicate through Firewall

  1. In the Windows Search bar, type Allow an app and open Allow an app through Windows Firewall.
  2. Click Change settings.
  3. Make sure that Cisco VPN is on the list, and it’s allowed to communicate through Windows Firewall.
    • If that’s not the case, click Allow another app and add it.
  4. Check both Private and Publicrong> network boxes.
  5. Confirm changes and open the Cisco VPN.

System updates can, quite frequently, change the system settings and preferences to default values. This misdeed, of course, can affect Windows Defender settings as well.

If that’s the case, chances are that lots of third-party apps that require free traffic through the Firewall won’t work. Including the Cisco VPN client.

That’s why we encourage you to check the settings and confirm that the app is indeed allowed in Windows Firewall settings.

3. Tweak the Registry

  1. Right-click on the Start button and open Device Manager.
  2. Expand Network adapters.
  3. Right-click on Virtual Adapter and update it.
  4. Restart your PC.

Like many other integrating VPN solutions, Cisco VPN comes with the specific associated Virtual Network Adapter. The failure of this device is another common occurrence, and it’s accompanied by the error code 442.

The first thing you can do if this error occurs is checking the Virtual Adapter driver in the Device Manager.

Now, if that fails to resolve the issue, you can try a Registry tweak which seems to address it fully. This requires administrative permission, in order to make changes to Registry.

Furthermore, we strongly suggest treading carefully since untaught meddling with Registry can result in a system failure.

Follow these steps to tweak Registry and repair Cisco VPN:

  1. Type Regedit in the Windows Search bar and open Registry Editor.
  2. Copy-paste the following path in the address bar:
    • HKEY_LOCAL_MACHINE/SYSTEM/Current/Control/SetServices/CVirtA
  3. Right-click on the DisplayName registry entry and choose Modify.
  4. Under the Value Data section, make sure that the only body of text which stands is the Cisco Systems VPN Adapter.
    • For the 64bit version, the text is the Cisco Systems VPN Adapter for 64-bit Windows.
  5. Save changes and try running Cisco VPN again.

4. Perform a clean reinstallation

  1. Navigate to Control Panel and open Uninstall a program.
  2. Search and select the Cisco AnyConnect Secure Mobility Client.
  3. Uninstall the Cisco AnyConnect Secure Mobility Client.
  4. Next, open up File Explorer by typing it in the Windows Search Bar.
  5. Go to the following path: C:\ProgramData\Cisco. The ProgramData folder may be hidden so click View at the top-left >Check Hidden items.
  6. Delete the folder named Cisco AnyConnect Secure Mobility Client.
  7. Lastly, go to the following path: C:\Users\ \AppData\Local\Cisco. The AppData folder may be hidden so click View at the top-left >Check Hidden items.
  8. Delete the folder named Cisco AnyConnect Secure Mobility Client.
  9. Restart your PC.
  10. Download the Cisco VPN client, here.
  11. Install the client and try running it.

Finally, if none of the previous solutions got Cisco VPN to work, the only remaining solution we can suggest is performing a clean reinstallation.

Ideally, this will require a clean slate install where you’ll clear all remaining associated files from your PC prior to installing Cisco VPN again.

Follow the above steps to perform a clean reinstallation and fix Cisco VPN on Windows 10. If Cisco VPN is not working on windows 11 the steps for fixing the error are the same.

If Cisco VPN is still not working on Windows 10 and 11, try contacting the support as they would more likely assist you in the best manner, you can also check our guide on what to do if your Cisco Anyconnect is not working through RDP.

That’s it. If you have any alternative solutions you care to share with us, feel free to do so in the comments section below.

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