Forcepoint even disabled, seems to slow down WSL dns resolution (especially AWS cli very slow) so remove when not required.
Install Forcepoint v6.10.0, look for the sgipsecvpn service and make it manual launch.
I could not use IPSEC gateway probably overlapping the 172.16.0.0 CIDR but use the SSL gateway then in a priviledged Powershell :
Get-NetIPInterface -InterfaceAlias "Ethernet" | Set-NetIPInterface -InterfaceMetric 6000
Get-NetAdapter | Where-Object {$_.InterfaceDescription -Match "Forcepoint"} | Set-NetIPInterface -InterfaceMetric 5000
After using VPN if connection is not working on WSL or desktop, stop the Forcepoint service as well
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Remember that for desktop usage, the IPSEC gateway has way more speed.