KB5066198 breaks SMB2: initial share access fails multiple times; when succeeds, it drops after 10 secs. (Windows 10 pro & home)

It looks like KB5066198 introduces SMB2 regression on Windows 10 pro and home (confirmed on 3 machines). Prior to this update, connections to an SMB2 share on an ASUS RT-AX86U Pro router were stable and maintained for a very long time. I verified that using netstat on the router. Since installing the KB, and only this KB, connecting via Windows CLI/Apps/File Explorer failed on the first attempt. E.g., the File Explorer shows the Windows cannot access \NAME-OR-IP-BOTH-FAIL/Folder pop up message. Insisting - i.e. retrying - 5-12 times eventually gains access to the shared folder. When a connecti

Question by Aerodyne on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.