When you say connects versus does not connect do you mean VPN connection , internet etc? I'm typing right now from a Dell XPS15 running Win11 with FortiClient 7.0.5 on a wired connection. What specifically does not work when wired? Sorry if iImissed that some place.
Please check if you have any endpoint control(sophos,symantec, etc) on that Windows 11. In some cases, this endpoint block the interface binding and makes the VPN connection failed. However, i need more information regarding the error. Are you reaching 40% or not. Reaching certain % means different kind of error.
This laptop gets wired connection only with an external USB adaptor. I decided to try several adaptors. FortiClient failed to establish VPN connection with the first 3 adaptors although they all provides stable 1Gbps connection. When I tried the 4th adaptor FortiCliet succeeded! I feel lucky, and now I just worry not to lose this 'special' adaptor...
Well, I think there must be some functions that don't allow you to use your new laptop like the old one, and I am sure you can change that in the settings. If you are sure your laptop works perfectly fine and this is the only issue, you can contact some specialists. I had a similar problem, and these guys: https://ifixit4u.co.uk/computer-services/laptop-repair/ were the ones who helped me. You can contact them and see if there is anything you can do to get rid of this problem and use all the functions you used on your old laptop.
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