Chronyd is not synchronizing with NTP server.

Issue

• Why is time is not in sync with ntp server . The output is reporting reach value is 0

  # chronyc -n sources -v
  
  MS Name/IP address         Stratum Poll Reach LastRx Last sample
  ===============================================================================
  ^? x.x.x.x                  0  10     0     -     +0ns[   +0ns] +/-    0ns
  ^? x.x.x.x                  0  10     0     -     +0ns[   +0ns] +/-    0ns
  ^? x.x.x.x                  0  10     0     -     +0ns[   +0ns] +/-    0ns
  

• Reach value of 0 indicates that the ntp client is unable to connect to the ntp servers at port 123.