CUPS in RHEL is unable to communicate with printer

Issue

• When we send a file to a printer, it just sits in the queue. I have increased the logging level. I am conercned about the following line:

  prnt/backend/hp.c 746: INFO: open device failed stat=12: hp:/net/HP_LaserJet?ip=10.1.2.3; will retry in 30 seconds...
  

• We can see many connection error for print queue:

  D [01/Jul/2015:16:26:20 +0100] [Job 1] Connection error: Connection timed out
  D [01/Jul/2015:16:26:20 +0100] [Job 1] Connection error: Connection timed out
  

• The following status is returned by the "lpstat -p" command:

  printer pr1 now printing pr1-97824.  enabled since Tue 15 May 2018 10:10:55 AM EDT
          The printer is not responding.
  printer pr33 now printing pr33-99134.  enabled since Tue 15 May 2018 12:03:25 PM EDT
          The printer is not responding.
  

• The following status is returned by the "lpstat -p" command:

  printer pr34 now printing pr34-23148.  enabled since Wed 16 Oct 2019 03:17:24 PM EDT
          The printer is unreachable at this time.
  printer lp3947 now printing lp3947-23835.  enabled since Wed 16 Oct 2019 02:56:51 PM EDT
          The printer is unreachable at this time.