Important EtherCAT configuration option

Today i tried active DC mode on and linuxcnc keep spamming this error:

Failed to get reference clock time: Input/output error
Failed to get reference clock time: Input/output error
Failed to get reference clock time: Input/output error
Failed to get reference clock time: Input/output error
Failed to get reference clock time: Input/output error
Failed to get reference clock time: Input/output error
Failed to get reference clock time: Input/output error

What causes this error? I'm using Linuxcnc 2.9.4 install from iso file.Here is my xml file and driver document:
drive.google.com/file/d/1ZTNpSNYDF0IL-IE...Bn4/view?usp=sharing
 
 

Got that too yesterday. Traced it to a bad kernel think it was 6.14-38 or so. Upgrade the kernel is my advice.
 

i 'm using 6.1.0-37-rt-amd64, which one should i update?

I didn't have that kernel version, so maybe that isn't the reason.
You got to have a well working system with no or at least very few "datagram UNMATCHED" in the syslog.
Check that first.

maybe if u have EoE active .. turn it off .. I creates mess on the bus...