Windows 11 and securextender frequent disconnects

IanH

Having major problems with having a stable connection on a Windows 11 pro laptop.  Have disabled wifi and using ethernet only.  Connection disconnecting after 2 minutes almost every time using a BT router, continuous ping which is sub 6ms and a 30+ broadband connection.

Have re-installed client, rebuilt laptop, disabled AV from the Zywall directory, turned off firewall as a test.  Also tried account from a seperate machine which is OK.

Zyxel_Kevin

Hi @IanH,
Please kindly find the following FAQ to check if the symptom is the same. 
https://community.zyxel.com/en/discussion/14013/ssl-vpn-disconnect-due-to-invalid-packet-size#latest
If the issue still , we can have remote session. 
Looking forward to your update.
Thank you

IanH

Fantastic, I will give this a try and will report my findings.  Thank you for your assistance. 👍

IanH

The packet size was set to 1374, the issue is the firewall is on an earlier version of firmware 

V5.30(ABAR.0) / 2022-04-20 01:43:59

Every time, I try and install the firmware it fails.  I have a workaround of setting up a ping but need to work out how to update.

Zyxel_Kevin

Hi @IanH, 
We have several SSLVPN issue on 5.30 .
Did you have any error meassage when the upgrade failed?
Kevin

IanH

Hi Kevin, no error, showing after the update.  Just the version is not changing from V5.30(ABAR.0) and then next log on, the update appears again.

Zyxel_Kevin

Hi @IanH, 
Could we have the remote session to check the firmware upgrade issue ?
We can start at 15:00 (UTC+8). Please kindly provide the remote information and available time via PM.
Thank you.