Guix, When visiting localhost:631/admin, the server appears to freeze (blank page). However, exactly 2 minutes later content is served and buttons like ‘Find New Printer’ [appear to] work without delay. Some error_log debug output below. Note the 2 neat 1-minute time-outs. It's likely that this is an upstream bug (but not quite this [1]). I'll try upgrading CUPS and gathering more infos. Kind regards, T G-R [1]: https://github.com/apple/cups/issues/5755 --8<---------------cut here---------------start------------->8--- D [26/Jun/2020:22:30:44 +0200] [Client 1199] Waiting for CGI data. D [26/Jun/2020:22:30:44 +0200] [CGI] admin.cgi started... D [26/Jun/2020:22:30:44 +0200] [CGI] http=0x572bbd388140 D [26/Jun/2020:22:30:44 +0200] [CGI] cgiSetVariable: SECTION=\"admin\" D [26/Jun/2020:22:30:44 +0200] [CGI] cgiSetVariable: REFRESH_PAGE=\"\" D [26/Jun/2020:22:30:44 +0200] [CGI] org.cups.sid cookie not found, initializing! D [26/Jun/2020:22:30:44 +0200] [CGI] org.cups.sid cookie is \"7be9c6067fac85f5930e650697b46a8e\" D [26/Jun/2020:22:30:44 +0200] [CGI] No form data, showing main menu... D [26/Jun/2020:22:31:44 +0200] Report: clients=100 D [26/Jun/2020:22:31:44 +0200] Report: jobs=0 D [26/Jun/2020:22:31:44 +0200] Report: jobs-active=0 D [26/Jun/2020:22:31:44 +0200] Report: printers=1 D [26/Jun/2020:22:31:44 +0200] Report: stringpool-string-count=2150 D [26/Jun/2020:22:31:44 +0200] Report: stringpool-alloc-bytes=14480 D [26/Jun/2020:22:31:44 +0200] Report: stringpool-total-bytes=43296 D [26/Jun/2020:22:32:44 +0200] [Client 807] Closing on unexpected HTTP read state HTTP_STATE_GET_SEND. D [26/Jun/2020:22:32:44 +0200] [Client 807] Closing connection. D [26/Jun/2020:22:32:44 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Active clients" I [26/Jun/2020:22:32:44 +0200] Resuming new connection processing... D [26/Jun/2020:22:32:44 +0200] Report: clients=99 D [26/Jun/2020:22:32:44 +0200] Report: jobs=0 D [26/Jun/2020:22:32:44 +0200] Report: jobs-active=0 D [26/Jun/2020:22:32:44 +0200] Report: printers=1 D [26/Jun/2020:22:32:44 +0200] Report: stringpool-string-count=2150 D [26/Jun/2020:22:32:44 +0200] Report: stringpool-alloc-bytes=14480 D [26/Jun/2020:22:32:44 +0200] Report: stringpool-total-bytes=43296 D [26/Jun/2020:22:32:44 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Active clients" D [26/Jun/2020:22:32:44 +0200] [Client 1200] Server address is "/var/run/cups/cups.sock". D [26/Jun/2020:22:32:44 +0200] [Client 1200] Accepted from localhost (Domain) D [26/Jun/2020:22:32:44 +0200] [Client 1200] Waiting for request. W [26/Jun/2020:22:32:44 +0200] Max clients reached, holding new connections... D [26/Jun/2020:22:32:44 +0200] [Client 1200] GET /admin/conf/cupsd.conf HTTP/1.1 D [26/Jun/2020:22:32:44 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Active clients" D [26/Jun/2020:22:32:44 +0200] [Client 1200] Read: status=200, state=3 D [26/Jun/2020:22:32:44 +0200] [Client 1200] No authentication data provided. D [26/Jun/2020:22:32:44 +0200] cupsdIsAuthorized: username="" D [26/Jun/2020:22:32:44 +0200] [Client 1200] cupsdSendHeader: code=401, type="text/html", auth_type=0 D [26/Jun/2020:22:32:44 +0200] [Client 1200] WWW-Authenticate: Basic realm=\"CUPS\", PeerCred, Local trc=\"y\" D [26/Jun/2020:22:32:44 +0200] [Client 1200] Closing connection. D [26/Jun/2020:22:32:44 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Active clients" I [26/Jun/2020:22:32:44 +0200] Resuming new connection processing... D [26/Jun/2020:22:32:44 +0200] [Client 811] Closing on unexpected HTTP read state HTTP_STATE_GET_SEND. D [26/Jun/2020:22:32:44 +0200] [Client 811] Closing connection. D [26/Jun/2020:22:32:44 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Active clients" D [26/Jun/2020:22:32:44 +0200] PID 7754 (/gnu/store/w6wnki4glaxxwmdh56fqf4yis3k7n8yg-cups-server-bin/lib/cups/cg> D [26/Jun/2020:22:32:44 +0200] [Client 815] Closing on unexpected HTTP read state HTTP_STATE_GET_SEND. D [26/Jun/2020:22:32:44 +0200] [Client 815] Closing connection. D [26/Jun/2020:22:32:44 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Active clients" D [26/Jun/2020:22:32:44 +0200] PID 7755 (/gnu/store/w6wnki4glaxxwmdh56fqf4yis3k7n8yg-cups-server-bin/lib/cups/cg> D [26/Jun/2020:22:32:44 +0200] [Client 819] Closing on unexpected HTTP read state HTTP_STATE_GET_SEND. D [26/Jun/2020:22:32:44 +0200] [Client 819] Closing connection. D [26/Jun/2020:22:32:44 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Active clients" D [26/Jun/2020:22:32:44 +0200] PID 7756 (/gnu/store/w6wnki4glaxxwmdh56fqf4yis3k7n8yg-cups-server-bin/lib/cups/cg> D [26/Jun/2020:22:32:44 +0200] [Client 823] Closing on unexpected HTTP read state HTTP_STATE_GET_SEND. D [26/Jun/2020:22:32:44 +0200] [Client 823] Closing connection. --8<---------------cut here---------------end--------------->8---