How to get admin access in CUPS?

Question

linux

Hello, I work under the Mint 17.3 system, after installing the epson p50 drivers, I needed to manage CUPS via the web. Of course, he opened access in the settings and added himself to the lp group.
Checked if I was in the group cat /etc/group | grep vitali
Answer:
lpadmin:x:108:vitali
BUT! when you enter the web interface and try to enter the login and password of the account, there is no login!
Here is the settings file itself, tell me where is my mistake?

LogLevel warn
MaxLogSize 0
SystemGroup lp
Port 631
Listen /var/run/cups/cups.sock
Browsing On
BrowseOrder allow,deny
BrowseLocalProtocols dnssd
DefaultAuthType Basic
WebInterface Yes
<Location />
  Order allow,deny
  Allow from @LOCAL
</Location>
<Location /admin>
  Order allow,deny
  Allow from @LOCAL
</Location>
<Location /admin/conf>
  AuthType Default
  Require user @SYSTEM
  Order allow,deny
</Location>
<Policy default>
  JobPrivateAccess default
  JobPrivateValues default
  SubscriptionPrivateAccess default
  SubscriptionPrivateValues default
  <Limit Create-Job Print-Job Print-URI Validate-Job>
    Order allow,deny
  </Limit>
  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document>
    Require user @OWNER @SYSTEM
    Order allow,deny
  </Limit>
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default CUPS-Get-Devices>
    AuthType Default
    Require user @SYSTEM
    Order allow,deny
  </Limit>
  <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs>
    AuthType Default
    Require user @SYSTEM
    Order allow,deny
  </Limit>
  <Limit Cancel-Job CUPS-Authenticate-Job>
    Require user @OWNER @SYSTEM
    Order allow,deny
  </Limit>
  <Limit All>
    Order allow,deny
  </Limit>
</Policy>
<Policy authenticated>
  JobPrivateAccess default
  JobPrivateValues default
  SubscriptionPrivateAccess default
  SubscriptionPrivateValues default
  <Limit Create-Job Print-Job Print-URI Validate-Job>
    AuthType Default
    Order allow,deny
  </Limit>
  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document>
    AuthType Default
    Require user @OWNER @SYSTEM
    Order allow ,deny
  </Limit>
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default>
    AuthType Default
    Require user @SYSTEM
    Order allow ,deny
  </Limit>
  <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs>
    AuthType Default
    Require user @SYSTEM
    Order allow,deny
  </Limit>
  <Limit Cancel-Job CUPS-Authenticate-Job>
    AuthType Default
    Require user @OWNER @SYSTEM
    Order allow,deny
  </Limit>
  <Limit All>
    Order allow,deny
  </Limit>
</Policy>
JobPrivateAccess default
JobPrivateValues default
SubscriptionPrivateAccess default
SubscriptionPrivateValues default

Answer 1

Checked if I was in the group cat /etc/group | grep vitali
Answer:
lpadmin:x:108:vitali

And in the lp group, it turns out, no?

Answer 2

I think Listen is redundant
https://wiki.archlinux.org/index.php/CUPS_(%D0%A0%...

By default, only localhost is allowed to access the CUPS web interface; those. the computer on which it is installed. To enable remote access, the following changes must be made to the /etc/cups/cupsd.conf file. Change the line:
Listen localhost:631
to
Port 631
so that CUPS can listen for incoming requests.