Studio 2021 SR2 - No Internet connection

My current installed release is TradosStudio2021SR2_16.2.8.9097.

I already checked the myriad of threads relating to this issue, and no suggested fixes work at all.

I also tried downgrading and upgrading, and the opposite, installing and de-installing World Server Compatibility Pack, and any combination of those.

I'm quite helpless because I cannot open GroupShare projects in my client, and my productivity is increasingly slowing down since my only poor workaround is using the Online Editor, but it is quite inconvenient and I would say awful at large.

Since this issue affects many users, could you please help provide a permanent fix or at least give me one that works for me?  The problem is undoubtedly due to SR2.

Thanks for your prompt help!