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atentik
December 9th, 2009, 06:24 PM
After upgrading to Karmic, my printer was nowhere to be found. I tried adding a new printer System->Administration->Printing... but whenever I do, I get the following error:


CUPS server error
There was an error during the CUPS operation: 'client-error-bad-request'
I spent about 2 hours trying to figure out what the problem might be but to no avail. I reinstall cups but nothing... Any suggestions?
atentik
December 11th, 2009, 05:41 PM
It is a shame nobody got a clue
atentik
December 11th, 2009, 07:39 PM
Ok, when I did
tail /var/log/cups/error_log, I get the following error.

Request from "localhost" using invalid Host: field ""
How do I change the localhost name?
Queue29
December 12th, 2009, 01:20 AM
Ok, when I did , I get the following error.

How do I change the localhost name?


Sounds like the update screwed your /etc/cups/cupsd.conf file. You need to open it up and fix things by hand.

Here's a generic one that I made:
http://bozosort.com/dloads/cupsd.conf

You need to edit the ip's at the bottom to match your LAN.
atentik
December 15th, 2009, 07:21 PM
Sounds like the update screwed your /etc/cups/cupsd.conf file. You need to open it up and fix things by hand.

Here's a generic one that I made:
http://bozosort.com/dloads/cupsd.conf

You need to edit the ip's at the bottom to match your LAN.

Thanks for the information. I tried modifying my cupsd.conf file to reflect the one you sent but the error message
Request from "localhost" using invalid Host: field "" persist. I changed the IP address as you advised. Any other alternative?
sloopveedub
December 16th, 2009, 06:54 AM
I'm certainly no expert and arrive at this thread whilst dinking around with my own CUPS issues, but perhaps it would be helpful to post your /etc/cups/cupsd.conf file here. Could be something as simple as a typo that another pair of eyes catches.
atentik
December 16th, 2009, 03:05 PM
I'm certainly no expert and arrive at this thread whilst dinking around with my own CUPS issues, but perhaps it would be helpful to post your /etc/cups/cupsd.conf file here. Could be something as simple as a typo that another pair of eyes catches.

Hey, thanks. That's a good idea. Here we go.


LogLevel warn
MaxLogSize 1m
SystemGroup lpadmin
# Allow remote access
ServerName 123.456.78.9
ServerAlias *
Port 631
Listen /var/run/cups/cups.sock
# Share local printers on the local network.
Browsing On
BrowseOrder allow,deny
BrowseAllow all
BrowseRemoteProtocols
BrowseAddress @LOCAL
BrowseLocalProtocols cups

DefaultAuthType Basic

<Location />
# Allow shared printing...
Order allow,deny
Allow all
</Location>
<Location /admin>
# Restrict access to the admin pages...
Order allow,deny
</Location>
<Location /admin/conf>
AuthType Default
Require user @SYSTEM
# Restrict access to the configuration files...
Order allow,deny
</Location>

<Policy default>
<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 CUPS-Move-Job CUPS-Get-Document>
Require user @OWNER @SYSTEM
Order deny,allow
</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 deny,allow
</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 CUPS-Accept-Jobs CUPS-Reject-Jobs>
AuthType Default
Require user @SYSTEM
Order deny,allow
</Limit>
<Limit Cancel-Job CUPS-Authenticate-Job>
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit All>
Order deny,allow
</Limit>
</Policy>
<Policy authenticated>
<Limit Create-Job Print-Job Print-URI>
AuthType Default
Order deny,allow
</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 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 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>
sloopveedub
December 19th, 2009, 10:20 AM
Are you able to access the CUPS web interface?
atentik
December 20th, 2009, 12:17 AM
Are you able to access the CUPS web interface?

Yes. I am able to do that. When I did that though, only the computers that have Ubuntu system connected to the server were able to print. All the others are unable to print, including the main server.
atentik
December 21st, 2009, 11:31 PM
My eyes are hurting reading from the monitor everyday. Still can't print from my server. Any suggestion?
atentik
December 30th, 2009, 07:12 PM
Still no solution to this problem? I hope I am the only one having this problem... cause it is not pretty having this problem and i don't want anybody else to go through it...
Muttley99
December 31st, 2009, 12:20 AM
Try adding;


Listen 127.0.0.1:631
Listen lan_ip_address:80

If this works add;


BrowseAllow from lan_ip_subnet (i.e. 192.168.1.0/24)
BrowseOrder deny,allow

to secure it again

I had problems with the conf file recently; I also found them difficult to pin down!
atentik
January 18th, 2010, 04:31 PM
Try adding;


Listen 127.0.0.1:631
Listen lan_ip_address:80

If this works add;


BrowseAllow from lan_ip_subnet (i.e. 192.168.1.0/24)
BrowseOrder deny,allow

to secure it again

I had problems with the conf file recently; I also found them difficult to pin down!

Tried this but to no avail. I am out of options now. Thanks to all those that tried helping.
atentik
February 4th, 2010, 07:52 PM
Can someone help?
cdunham
March 14th, 2010, 06:27 PM
Try adding:

ServerAlias *

to /etc/cups/cupsd.conf and restarting cups.
n4ym
April 6th, 2012, 08:28 PM
I was having a similar issue in logfile (and showing 'Bad Request' in browser), so I tried a bunch of things with curl, mainly mixing combinations of the Host header and the actual hostname (IP) used in the connection (ocean is my hostname, and resolves in DNS):

Fail: curl -H 'Host: ocean:631' http://ocean:631/printers/
Fail: curl -H 'Host: ocean' http://ocean:631/printers/
Success: curl -H 'Host: localhost:631' http://localhost:631/printers/

It turns out my first two lines of /etc/hosts were:

127.0.0.1 localhost
127.0.1.1 ocean

I think this is a NetworkManager thing (oneiric)...

So while cupsd.conf had a Listen 0.0.0.0:631 line, cups did not like connections coming in on 127.0.1.1.
I removed the second line above and was able to connect...
shved
March 7th, 2013, 07:41 PM
Maybe I last, but when I'm trying to connect from my laptop to PC's printer server, using hostname "shvedPC" from /etc/hosts I geted same error and
<code> Request from "192.168.0.100" using invalid Host: field "shvedPC"</code>
lines in cups logs. Using real IP 192.168.0.100 in server's host addres solved my problem. Try to use 127.0.0.1 istead localhost.