NTP failure but NTP Servers are well

Hi !

Today i receiced a message fro mTruenas about an NTP failure:

NTP health check failed - No Active NTP peers: [{‘SERVER: SELECTABLE [192.168.63.88]’}, {‘SERVER: SELECTABLE [192.168.63.89]’}, {‘SERVER: FALSE_TICKER [192.168.63.1]’}, {‘SERVER: SELECTABLE [192.168.63.254]’}]

I read to check and i checked but everything is OK… because my NTP server in Internet which iss connected to NTP pool also says that everything is fine (see below)
So i assume that it comes from truenas
there are 4 NTP server in the network whoch contain
2x DCF77 Signal (the first 2)
2x GPS with PPS (last 2)

Even if i would have no internet connection there must not be a failure because all 4 servers are in the internal network

MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^+ firewall_wg                   1  10   377  1006   -200us[ -339us] +/- 7403us
^+ capricorn                     1  10   377  1198   +762us[ +626us] +/- 7937us
^* pi4cm                         1  10   377   998   -801us[ -940us] +/- 7292us
^+ pi4hole                       1  10   377  1146   -504us[ -641us] +/- 7086us


Ciao Gerd