Thanks to everyone for your combined efforts in troubleshooting this latest vpn client issue, what a fiasco. I can confirm that removing KB5009566 on Win11 resolved the issue for me. I lost 13vpn configs on my machine yesterday, a pain to say the lease. Now off to do a regression patch on a mind numbing number of client systems, Gack! I have been dealing with random windows client vpn connection issues on MX devices for over a year now. Have tried all the methods to resolve, not one consistently is the fix however. One method I have tried which is partially documented is the removal of all wan miniports, but before scanning for hardware changes to re-install I would configure the required vpn's and when finished I would then re-install the miniports. Have no idea why, but that process has worked on quite few win 10 machines over the past several months.
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