Hi,
Thank you for answer!
I am sorry, my HW:
Supermicro MBD-X11SSH-F
Samsung Memory 16GB 288Pin DIMM DDR4, M391A2K43BB1-CRC
Intel Xeon E3-1220 v6
At this moment I am using U4 version. I cannot switch back to U3 version because the server is working now. I cannot do a test if this problem begun after updating from version U2 to U3.
But in version U2 the IPMI button was there and I did some setup via this button.
The server works correctly. And at first moment I did not notice that the button is out.