- Slave server cannot be synced with Master DNS server: it is marked with a red exclamation mark in Extensions menu and is listed as "not connected"
- The following error appears in
CONFIG_TEXT: invalid command from 188.8.131.52#57406: expired
- The time is different on the Master and Slave servers:
Wed Jan 10 02:44:29 CET 201
Wed Jan 10 02:45:55 CET 2018
Time is not synchronized on Master and Slave DNS servers.
Synchronize time on Master and Slave DNS servers.