No more connection with Windows server

[maxphotos1]

I have 2 machines and only today (after Christmas holidays) I found out that I cannot connect anymore to the windows server in the office.
This is happening on 2 machines under the same network configurations.

1) MBP 16" with Big Sure 11.1 (last update available)
2) Imac 27" with Catalina 10.15.7 (last update available)

They were both OK before installing last updates....

I tried:
smb://mypc@10.0.0.2/ but it didn't work any more.

I heard this is happening to somebody else.
Any idea ??