CUPS Changing AuthInfoRequired from username,password to none with https URI

Question

I have two CentOS 6 servers running cups and connecting to the same ipp over https printer. Both were installed with the same lpadmin command below.

lpadmin -p ptr -v https://username%40mailer.com:p%40ssword@myprintserver.com/printer -E

Server 1 was able to print without issue.

Cups

Name        : cups
Arch        : x86_64
Epoch       : 1
Version     : 1.4.2
Release     : 44.el6

printers.conf

<Printer ptr>
AuthInfoRequired username,password
Info ptr
DeviceURI https://username%40mailer.com:p%40ssword@myprintserver.com/printer

Server 2 is not able to print

Cups

Name        : cups
Arch        : x86_64
Epoch       : 1
Version     : 1.4.2
Release     : 78.el6_9

printers.conf

<Printer ptr>
AuthInfoRequired none
Info ptr
DeviceURI https://username%40mailer.com:p%40ssword@myprintserver.com/printer

In /var/log/cups/error_log

D [26/Oct/2017:10:31:53 -0400] [Job 220770] Connected to printer...
D [26/Oct/2017:10:31:53 -0400] [Job 220770] Connected to my-printserverip:443 (IPv4)...
D [26/Oct/2017:10:31:53 -0400] [Job 220770] Getting supported attributes...
D [26/Oct/2017:10:31:53 -0400] [Job 220770] ATTR: auth-info-required=none
D [26/Oct/2017:10:31:53 -0400] [Job 220770] Backend returned status 2 (authentication required)
D [26/Oct/2017:10:31:53 -0400] [Job 220770] Job held for authentication.

On Server 2 I tried stoping cups, changing AuthInfoRequired from none to username,password and then starting cups however it doesn't fix it and on the next cups restart just reverts back to none. I tried bouncing cups on Server 1 and it retains the username,password. I then updated Server 1 to version 78.el6_9, uninstalling and reinstalling ptr with the above lpadmin command and now both servers are in the same boat reverting to AuthInfoRequired none and Job held for authentication.

Is there something different I need to do with the new version of cups?

I have tried passing -o auth-info=username,password, however this appears to make the AuthInfoRequired line disappear all together and results in the same errors in the log as above.

Update 1:

Testing with CentOS 7 gives expected behavior of automatically populating AuthInfoRequired with username,password CUPS version 1.6.3-26

Update 2:

Tried to rpmrepack cups 1.4.2-44 from another CentOS 6 server and rpm downgrade to the prior older version with no success.

Update 3:

I have started reading the cups source code for my version. It appears the AuthInfoRequired field is automatic set for ipp printers based on if cups see's a password in the DeviceURI, not sure why it's tossing my Auth info out the window.

Answer 1

Instead of auth-info=username,password use auth-info-required (eg -o auth-info-required=username,password). CUPS rewrites printers.conf when stopping (see the man page, CUPS source), so to edit the file either stop the CUPS server first or use lpoptions.

If you revert to 1.4.2-44 and set auth-info-required you should be back to being able to print.