Solution
Using variables, change the start profile entry for the IGS and shorten the individual lines (so that they have less than 80 characters if possible) and restart the MMC and the system.
Example:
_IGS = igswd.exe
IGSD = -dir=$(DIR_INSTANCE)\igs
IGSP = -mode=all -sysname=$(SAPSYSTEMNAME) -sysno=$(SAPSYSTEM)
Start_Program_06 = local $(DIR_INSTANCE)\igs\bin\$(_IGS) $(IGSD) $(IGSP)

You installed a dedicated gateway (= what is known as a gateway instance) under NT.

The corresponding NT service ("SAP<SID>_<##>") starts automatically, however, the gateway is not active - in the SAP Service Manager (sservmgr.exe, call with parameter "<SID>_<##>") the gateway does not appear (active = green light).

You want the dedicated gateway to be immediately started also.
Additional key words

Gateway Autostart NT sservmgr.exe gwrd.exe Startprofile
Cause and prerequisites

The autostart entry is missing in the start-up profile.
Solution

Add the following line in the start profile of the gateway instance <SID>_<##> (File: \\<host>\sapmnt\<SID>\SYS\profile\START_G<##>):

           Autostart = 1

           (then press the Enter key and store the file)


When you start NT services "SAP<SID>_<##>" the next time the gateway is also started.