diff -up cups-2.2.5/scheduler/main.c.systemd-socket cups-2.2.5/scheduler/main.c

--- cups-2.2.5/scheduler/main.c.systemd-socket	2017-10-17 18:59:53.732431498 +0200

+++ cups-2.2.5/scheduler/main.c	2017-10-17 19:02:13.132275861 +0200

@@ -691,8 +691,16 @@ main(int  argc,				/* I - Number of comm

 #ifdef HAVE_ONDEMAND

   if (OnDemand)

+  {

     cupsdAddEvent(CUPSD_EVENT_SERVER_STARTED, NULL, NULL, "Scheduler started on demand.");

-  else

+# ifdef HAVE_SYSTEMD

+    sd_notifyf(0, "READY=1\n"

+               "STATUS=Scheduler is running...\n"

+               "MAINPID=%lu",

+               (unsigned long) getpid());

+# endif /* HAVE_SYSTEMD */

+  } else

+

 #endif /* HAVE_ONDEMAND */

   if (fg)

     cupsdAddEvent(CUPSD_EVENT_SERVER_STARTED, NULL, NULL, "Scheduler started in foreground.");

diff -up cups-2.2.5/scheduler/org.cups.cupsd.path.in.systemd-socket cups-2.2.5/scheduler/org.cups.cupsd.path.in

--- cups-2.2.5/scheduler/org.cups.cupsd.path.in.systemd-socket	2017-10-13 20:22:26.000000000 +0200

+++ cups-2.2.5/scheduler/org.cups.cupsd.path.in	2017-10-17 18:59:53.732431498 +0200

@@ -3,7 +3,7 @@ Description=CUPS Scheduler

 PartOf=org.cups.cupsd.service

 [Path]

-PathExists=@CUPS_CACHEDIR@/org.cups.cupsd

+PathExistsGlob=@CUPS_REQUESTS@/d*

 [Install]

 WantedBy=multi-user.target

diff -up cups-2.2.5/scheduler/org.cups.cupsd.service.in.systemd-socket cups-2.2.5/scheduler/org.cups.cupsd.service.in

--- cups-2.2.5/scheduler/org.cups.cupsd.service.in.systemd-socket	2017-10-13 20:22:26.000000000 +0200

+++ cups-2.2.5/scheduler/org.cups.cupsd.service.in	2017-10-17 18:59:53.732431498 +0200

@@ -1,10 +1,11 @@

 [Unit]

 Description=CUPS Scheduler

 Documentation=man:cupsd(8)

+After=network.target

 [Service]

 ExecStart=@sbindir@/cupsd -l

-Type=simple

+Type=notify

 [Install]

 Also=org.cups.cupsd.socket org.cups.cupsd.path