I am having ArcGIS Server 10.7.1 installed which was working fine. I don't know what triggered the issue but suddenly one of my GP Services was not giving response to a Job status request. I restarted the ArcGIS Server service from the system services dialog in my windows server. Only the ArcGIS Server service got started and I cannot see any ArcSOC instances or the Javaw processes running in the processes list.
Because of this I am not able to connect to ArcGIS Server Manager or ArcGIS Admin.
I did some digging and found below log one of the log file present in the path (C:\Program Files\ArcGIS\Server\framework\etc\service\logs).
Mon Sep 21 03:41:24.578 MDT 2020 log4j:WARN No appenders could be found for logger (org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager).
Mon Sep 21 03:41:24.579 MDT 2020 log4j:WARN Please initialize the log4j system properly.
Mon Sep 21 03:41:24.580 MDT 2020 log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Mon Sep 21 03:42:54.459 MDT 2020 java.lang.RuntimeException: Unable to connect to Log Service
Mon Sep 21 03:42:54.459 MDT 2020 at com.esri.arcgis.discovery.logging.Logger.b(Logger.java:423)
Mon Sep 21 03:42:54.459 MDT 2020 at com.esri.arcgis.discovery.logging.Logger.access$300(Logger.java:46)
Mon Sep 21 03:42:54.459 MDT 2020 at com.esri.arcgis.discovery.logging.Logger$c.a(Logger$c.java:522)
Mon Sep 21 03:42:54.459 MDT 2020 at com.esri.arcgis.discovery.logging.Logger$c.a(Logger$c.java:463)
Mon Sep 21 03:42:54.459 MDT 2020 at com.esri.arcgis.discovery.logging.Logger$c.run(Logger$c.java:503)
I repaired the ArcGIS Server installation from Programs and Features in control panel along with running Configure ArcGIS Server Account application but still it did not resolve the issue.
Thanks in Advance