Blank Screen when connecting to Cisco AnyConnect

[Jane John]

Hi,

A few users are getting blank page when trying to click connect in Cisco AnyConnect application (4.10.05111) using Windows 10 machines. Uninstalling and reinstalling the application seems to be working only till the next reboot.
Any suggestions?

Thanks!
Jane

[Marius Gunnerud]

• Is the VPN headend an ASA, FTD or Router?  Please also provide model and software version.
• Is it always the same users that are experiencing the issue, or does the issue move from one user to another with time?
• Which authentication method are you using?
• Are all users using windows 10, or are there some using Windows 11? 
• Are there Windows 10 machines that do not have this issue?

Could you recreate the issue and then collect a DART bundle and post it here.  Also provide the output of the following command:

show vpn-sessiondb summary

Edit: I have moved this post to Network Security discussion board.

[Jane John]

Hi Marius,
Please find the details below.

• Is the VPN headend an ASA, FTD or Router?  Please also provide model and software version. ASA
• Is it always the same users that are experiencing the issue, or does the issue move from one user to another with time? The issue started a few week ago and the same users are facing the issue.
• Which authentication method are you using? SAML authentication / Single Sign On (SSO)
• Are all users using windows 10, or are there some using Windows 11? WIndows 10
• Are there Windows 10 machines that do not have this issue? Yes.Only a few users facing this issue.
  Issue Details:
  A few Windows users are unable to connect Cisco AnyConnect Secure Mobility Client version 4.10.05111. When they open the app and click on connect, a blank page appears instead of the SSO login page and disappears immediately. It works fine if we quit the app from system tray and relaunch, till the next reboot. And restarting the Cisco AnyConnect Secure mobility Client from the Services also works.Event log shows an issue with acwebhelper.exe.
  Troubleshooting done:
  -Ran acwebhelper compatibility troubleshooting and set to recommended setting.
  -Ran vpnui compatibility troubleshooting and set to recommended setting.
  -Default browser changed from Edge to Chrome and vice versa.
  -Browser reset done.
  -Uninstalled Cisco AnyConnect Secure mobility client and cleared Temp files and removed Cisco files from user local profile and reinstalled the app from Company portal. It worked till the next reboot.
  
  
  

[Marius Gunnerud]

Have you tried upgrading the AnyConnect version on the affected clients to 5.x.  Would this be an option?

[MHM Cisco World]

Are all user run same OS 

If yes then it issue of OS of user' probably they update OS and new OS ver. Not compatible with anyconnect ver.

If user use different OS then there is issue in your ASA.

Can I see SMAL config you use 

MHM

[hb764934]

Hello,

Great questions! If all users are running the same OS, the issue might indeed be related to the OS update. It's possible that the new OS version is not compatible with the current AnyConnect version.

However, if users are on different operating systems and encountering similar issues, it could point to a problem with the ASA configuration FR Legends Latest Pro Version Mod Apk  .

To better assist you, could you please share the specific configuration details you are using? This will help me provide more targeted advice.

Looking forward to hearing from you,

[Marius Gunnerud]

I suggest upgrading the AnyConnect client on the affected devices to the latest version.

Also run "debug webvpn anyconnect 255" (without the quotes) and try connected from an affected device that is currently experiencing the issue and post the output here, preferably in a separate file attached to the post.

If you could also collect the DART file I previously requested as this can possibly help us identify what is failing.

The following link explains how to collect the DART file:

https://www.cisco.com/c/en/us/td/docs/security/vpn_client/anyconnect/anyconnect42/administration/guide/b_AnyConnect_Administrator_Guide_4-2/troubleshoot-anyconnect.html#id_100446

Another option, though quite drastic, would be to do a clean install of Windows 10 on the affected machines, and then install AnyConnect and see if the issue persists.