Cisco secure client

[kobztrain]

Hello , I always have this issue when connecting to Cisco vpn , “The VPN connection was terminated to enforce a newly determinated tunnel MTU and could not be automatically re-istablished. A new connection is necessary, which requires re-authentification."

how do I fix it ?

I use a windows 10 i5 dell desktop 

[balaji.bandi]

contact your security administrator, look the troubleshoot methods :

https://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-firewalls/212972-anyconnect-vpn-client-troubleshooting-gu.html

[MHM Cisco World]

Disable dtls in FW and check

MHM

[BlakeBratu]

Hi Kobz,

Is this happening when the device goes into connected standby (goes into sleep/hibernation) or does this happen during normal use and pops up during an activity (such as web browsing?) Is it also just happening to you or other users? As far as I know, this is caused because the parent tunnel runs off of a TLS session, which has a differing MTU than the DTLS session of your user tunnel. So if you for example place the computer to sleep, the parent tunnel attempts to hold the session until it can re-establish to the user tunnel. I've solved this by changing the MTU on the ASA/FTD to match a TLS MTU of 1300.

We would need to know more about your situation though.