Originally posted by: 5CRW_ITS_Support
I fit may help output from cups error_log on server during lpstat -v
D [17/May/2019:11:51:28 +0200] [Client 665] Accepted from x.x.x.x:44892 (IPv4)
D [17/May/2019:11:51:28 +0200] [Client 665] Waiting for request.
I [17/May/2019:11:51:28 +0200] Expiring subscriptions...
D [17/May/2019:11:51:28 +0200] [Client 665] POST / HTTP/1.1
D [17/May/2019:11:51:28 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [17/May/2019:11:51:28 +0200] [Client 665] Read: status=200
D [17/May/2019:11:51:28 +0200] [Client 665] No authentication data provided.
D [17/May/2019:11:51:28 +0200] [Client 665] 2.0 CUPS-Get-Printers 1
D [17/May/2019:11:51:28 +0200] CUPS-Get-Printers
D [17/May/2019:11:51:28 +0200] [Client 665] Returning IPP successful-ok for CUPS-Get-Printers (no URI) from x.x.x.x
D [17/May/2019:11:51:28 +0200] [Client 665] Content-Length: 20030
D [17/May/2019:11:51:28 +0200] [Client 665] cupsdSendHeader: code=200, type="application/ipp", auth_type=0
D [17/May/2019:11:51:28 +0200] [Client 665] con->http=0x55921af630c0
D [17/May/2019:11:51:28 +0200] [Client 665] cupsdWriteClient error=0, used=0, state=HTTP_STATE_POST_SEND, data_encoding=HTTP_ENCODING_LENGTH, data_remaining=20030, response=0x55921af93530(IPP_STATE_DATA), pipe_pid=0, file=-1
D [17/May/2019:11:51:28 +0200] [Client 665] Writing IPP response, ipp_state=IPP_STATE_DATA, old wused=0, new wused=0
D [17/May/2019:11:51:28 +0200] [Client 665] bytes=0, http_state=0, data_remaining=20030
D [17/May/2019:11:51:28 +0200] [Client 665] Flushing write buffer.
D [17/May/2019:11:51:28 +0200] [Client 665] New state is HTTP_STATE_WAITING
D [17/May/2019:11:51:28 +0200] [Client 665] Waiting for request.
D [17/May/2019:11:51:28 +0200] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
I [17/May/2019:11:51:29 +0200] Expiring subscriptions...
D [17/May/2019:11:56:30 +0200] [Client 676] Accepted from x.x.x.x:44921 (IPv4)
D [17/May/2019:11:56:30 +0200] [Client 676] Waiting for request.
D [17/May/2019:11:56:30 +0200] [Client 676] POST / HTTP/1.1
D [17/May/2019:11:56:30 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [17/May/2019:11:56:30 +0200] [Client 676] Read: status=200
D [17/May/2019:11:56:30 +0200] [Client 676] No authentication data provided.
D [17/May/2019:11:56:30 +0200] [Client 676] 2.0 CUPS-Get-Default 2
D [17/May/2019:11:56:30 +0200] CUPS-Get-Default
D [17/May/2019:11:56:30 +0200] CUPS-Get-Default client-error-not-found: No default printer.
D [17/May/2019:11:56:30 +0200] [Client 676] Returning IPP client-error-not-found for CUPS-Get-Default (no URI) from x.x.x.x
D [17/May/2019:11:56:30 +0200] [Client 676] Content-Length: 113
D [17/May/2019:11:56:30 +0200] [Client 676] cupsdSendHeader: code=200, type="application/ipp", auth_type=0
D [17/May/2019:11:56:30 +0200] [Client 676] con->http=0x55921af630c0
D [17/May/2019:11:56:30 +0200] [Client 676] cupsdWriteClient error=0, used=0, state=HTTP_STATE_POST_SEND, data_encoding=HTTP_ENCODING_LENGTH, data_remaining=113, response=0x559219fef0c0(IPP_STATE_DATA), pipe_pid=0, file=-1
D [17/May/2019:11:56:30 +0200] [Client 676] Writing IPP response, ipp_state=IPP_STATE_DATA, old wused=0, new wused=0
D [17/May/2019:11:56:30 +0200] [Client 676] bytes=0, http_state=0, data_remaining=113
D [17/May/2019:11:56:30 +0200] [Client 676] Flushing write buffer.
D [17/May/2019:11:56:30 +0200] [Client 676] New state is HTTP_STATE_WAITING
D [17/May/2019:11:56:30 +0200] [Client 676] Waiting for request.
D [17/May/2019:11:56:30 +0200] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"
I [17/May/2019:11:56:31 +0200] Expiring subscriptions...
D [17/May/2019:12:01:31 +0200] [Client 689] Accepted from x.x.x.x:44951 (IPv4)
D [17/May/2019:12:01:31 +0200] [Client 689] Waiting for request.
D [17/May/2019:12:01:31 +0200] [Client 689] POST / HTTP/1.1
D [17/May/2019:12:01:31 +0200] cupsdSetBusyState: newbusy="Active clients and dirty files", busy="Dirty files"
D [17/May/2019:12:01:31 +0200] [Client 689] Read: status=200
D [17/May/2019:12:01:31 +0200] [Client 689] No authentication data provided.
D [17/May/2019:12:01:31 +0200] [Client 689] 2.0 CUPS-Get-Printers 3
D [17/May/2019:12:01:31 +0200] CUPS-Get-Printers
D [17/May/2019:12:01:31 +0200] [Client 689] Returning IPP successful-ok for CUPS-Get-Printers (no URI) from x.x.x.x
D [17/May/2019:12:01:31 +0200] [Client 689] Content-Length: 2887
D [17/May/2019:12:01:31 +0200] [Client 689] cupsdSendHeader: code=200, type="application/ipp", auth_type=0
D [17/May/2019:12:01:31 +0200] [Client 689] con->http=0x55921af630c0
D [17/May/2019:12:01:31 +0200] [Client 689] cupsdWriteClient error=0, used=0, state=HTTP_STATE_POST_SEND, data_encoding=HTTP_ENCODING_LENGTH, data_remaining=2887, response=0x559219fef0c0(IPP_STATE_DATA), pipe_pid=0, file=-1
D [17/May/2019:12:01:31 +0200] [Client 689] Writing IPP response, ipp_state=IPP_STATE_DATA, old wused=0, new wused=0
D [17/May/2019:12:01:31 +0200] [Client 689] bytes=0, http_state=0, data_remaining=2887
D [17/May/2019:12:01:31 +0200] [Client 689] Flushing write buffer.
D [17/May/2019:12:01:31 +0200] [Client 689] New state is HTTP_STATE_WAITING
D [17/May/2019:12:01:31 +0200] [Client 689] Waiting for request.
D [17/May/2019:12:01:31 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Active clients and dirty files"
D [17/May/2019:12:01:31 +0200] [Client 689] HTTP_STATE_WAITING Closing for error 32 (Broken pipe)
D [17/May/2019:12:01:31 +0200] [Client 689] Closing connection.
D [17/May/2019:12:01:31 +0200] cupsdSetBusyState: newbusy="Dirty files", busy="Dirty files"
I [17/May/2019:12:01:32 +0200] Expiring subscriptions...
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