Same problem here. This is the content of my /var/log/cups/error_log file:
W [26/May/2015:14:10:58 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:10:58 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:10:58 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:10:58 -0400] Max clients reached, holding new connections...
E [26/May/2015:14:14:54 -0400] [Client 310] Local authentication certificate not found.
W [26/May/2015:14:14:54 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:14:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:14:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:14:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:14:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:17:21 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:17:21 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:17:21 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:17:21 -0400] Max clients reached, holding new connections...
E [26/May/2015:14:19:55 -0400] [Client 599] Local authentication certificate not found.
W [26/May/2015:14:19:55 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:55 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:55 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:56 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:57 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:57 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:57 -0400] Max clients reached, holding new connections...
W [26/May/2015:14:19:57 -0400] Max clients reached, holding new connections...
Same problem here. This is the content of my /var/log/ cups/error_ log file: 2015:14: 10:58 -0400] Max clients reached, holding new connections... 2015:14: 10:58 -0400] Max clients reached, holding new connections... 2015:14: 10:58 -0400] Max clients reached, holding new connections... 2015:14: 10:58 -0400] Max clients reached, holding new connections... 2015:14: 14:54 -0400] [Client 310] Local authentication certificate not found. 2015:14: 14:54 -0400] Max clients reached, holding new connections... 2015:14: 14:56 -0400] Max clients reached, holding new connections... 2015:14: 14:56 -0400] Max clients reached, holding new connections... 2015:14: 14:56 -0400] Max clients reached, holding new connections... 2015:14: 14:56 -0400] Max clients reached, holding new connections... 2015:14: 17:21 -0400] Max clients reached, holding new connections... 2015:14: 17:21 -0400] Max clients reached, holding new connections... 2015:14: 17:21 -0400] Max clients reached, holding new connections... 2015:14: 17:21 -0400] Max clients reached, holding new connections... 2015:14: 19:55 -0400] [Client 599] Local authentication certificate not found. 2015:14: 19:55 -0400] Max clients reached, holding new connections... 2015:14: 19:55 -0400] Max clients reached, holding new connections... 2015:14: 19:55 -0400] Max clients reached, holding new connections... 2015:14: 19:56 -0400] Max clients reached, holding new connections... 2015:14: 19:56 -0400] Max clients reached, holding new connections... 2015:14: 19:56 -0400] Max clients reached, holding new connections... 2015:14: 19:56 -0400] Max clients reached, holding new connections... 2015:14: 19:57 -0400] Max clients reached, holding new connections... 2015:14: 19:57 -0400] Max clients reached, holding new connections... 2015:14: 19:57 -0400] Max clients reached, holding new connections... 2015:14: 19:57 -0400] Max clients reached, holding new connections...
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