any ideas on this one? I'm trying to print to a CUPS printer running on Debian from a Mac running OSX 10.11 El Capitan. When I try to print, my /var/log/cups/error_log reads:

D [12/Oct/2015:00:59:04 +0100] [Client 3] Accepted from [v1.fe80::a65e:60ff:fec1:9b01+eth0]:55661 (IPv6)
D [12/Oct/2015:00:59:04 +0100] [Client 3] Waiting for request.
I [12/Oct/2015:00:59:04 +0100] [Client 3] Connection now encrypted.
D [12/Oct/2015:00:59:04 +0100] [Client 3] POST /printers/HomePrinter HTTP/1.1
D [12/Oct/2015:00:59:04 +0100] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [12/Oct/2015:00:59:04 +0100] [Client 3] Read: status=200
D [12/Oct/2015:00:59:04 +0100] [Client 3] No authentication data provided.
D [12/Oct/2015:00:59:04 +0100] [Client 3] cupsdSendHeader: code=403, type="text/html", auth_type=0
D [12/Oct/2015:00:59:04 +0100] [Client 3] Closing connection.
D [12/Oct/2015:00:59:04 +0100] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
D [12/Oct/2015:00:59:04 +0100] [Client 3] Waiting for socket close.
D [12/Oct/2015:00:59:04 +0100] [Client 3] Read: status=100
D [12/Oct/2015:00:59:04 +0100] [Client 3] Read: status=100
D [12/Oct/2015:00:59:04 +0100] [Client 3] Read: status=100
D [12/Oct/2015:00:59:04 +0100] [Client 3] Read: status=100
D [12/Oct/2015:00:59:04 +0100] [Client 3] Read: status=100

and then fills up the log file with millions (literally) of lines like this until the entire partition is full!

The Mac machine says: "Hold for authentication", but I'm not aware of having requested authentication in the CUPS configuration, so I'm really at a loss. I can post my cups configuration if that would be of help.

Any guidance would be gratefully appreciated!

Thanks, Julian

  • `code=403` that's HTTP 403 "Forbidden"
    – Jasen
    Dec 25, 2016 at 6:38
  • Yes, indeed, Jasen. The answer below about IPv6 solved the issue, and the connections are no longer forbidden. Dec 29, 2016 at 19:06

1 Answer 1


I had this issue too. In my case, it turned out that a server-side configuration change was required, specifically, in "Admin" -> "Server", enable "Allow printing from the Internet".

Not quite certain why, but it seems that perhaps El Capitan is preferring IPv6 and CUPS on the server-side is interpreting this as an "Internet" access rather than local network.


  • 1
    You're so right! Thank you. I'm using CUPS on a Linux machine, so I added this entry to my cupsd.conf file: Allow from [fe80::]/10 and now all works! Dec 25, 2015 at 10:49
  • @julian-gilbey Where should this directive be included in the cups.conf file?
    – Graham
    Jan 3, 2016 at 15:20
  • @Graham I have it in my Location section, as follows (apologies about lack of newlines - I can't figure out how to put them in responses, so I've written \n instead): # Restrict access to the server...\n <Location />\n Order allow,deny\n Allow from localhost\n Allow from 192.168.0.*\n Allow from [fe80::]/10\n </Location> Jan 19, 2016 at 21:44

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