Cannot establish a secure connection with the CUPS Web user interface

Solution Unverified - Updated -

Issue

  • We keep getting alerts from because of the following errors in the CUPS error_log:

    E [04/Mar/2021:08:43:01 -0500] error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown
    E [04/Mar/2021:16:51:00 -0500] Unable to encrypt connection from 10.100.0.79.
    
  • In RHEL 6, we are receiving the following errors in the CUPS error_log:

    E [25/May/2021:12:30:23 -0400] Unable to encrypt connection from 10.146.100.12 - A TLS fatal alert has been received.
    
  • Whenever we try to connect to CUPS via the https:// URI to perform administrative functions, our Chrome browser shows an error like the following:

    https://10.1.8.4:631/admin
    
    This site can’t provide a secure connection
    10.1.8.4 sent an invalid response.
    Try running Windows Network Diagnostics.
    ERR_SSL_PROTOCOL_ERROR
    

Environment

  • Red Hat Enterprise Linux (RHEL), all versions
  • Common Unix Printing System (CUPS), all versions

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