Keep getting a warning in Server log says "Failed to log in"

[QiranLiang]

I keep getting this warning that said "Failed to log in. Invalid username or password specified." Although during that time nobody is trying to login at all. 

This warning will appears every 5 seconds or so and it never stop. Anyone have any idea why it happens?

[Marc_Graham]

Hi @JonathanQuinn ,

We are also getting this error on our 10.7 install. In additional when I validate the tile cache in Server Manager it is a green tick, but when I validate through the Server Admin I get the following error. Funnily enough your documentation here https://developers.arcgis.com/rest/enterprise-administration/server/validatedatastore.htm shows the same error. Can you please advise what we can do to fix this? Uninstalling and reinstalling the data store is not an option due to the volume of content in our Production portal.

Cheers,

Marc

 "datastore.status": "Started",
  "datastore.isActiveHA": "true",
  "datastore.overallhealth": "Healthy",
  "messages": [{"msg": "WARNING Machine 'https://XXXXX-GIS.XXXX.NET:6443/arcgis/admin/generateToken' returned an error. 'Failed to log in. Invalid username or password specified.'"}],
  "datastore.isRegistered": "true",
  "datastore.hasValidServerConnection": "false",
  "datastore.invalidServerMachinesList": [{
    "machineName": "APPNZ30-GIS.BECA.NET",
    "adminURL": "https://XXXXX-GIS.XXXX.NET:6443/arcgis/admin"
  }],

[Marc_Graham]

We were able to remove this error by unregistering and re-registering our tile cache data store with the ArcGIS Server site.  When re-registering the site the ArcGIS Server primary site admin credentials were updated - this fixed the problem.  Clearly these credentials are cached somewhere in the Tile Cache data store.

[RogerDunnGIS]

I inherited a 10.8.1 server that keeps doing this.  We have Server and Portal federated on the same machine.  When I look at all the columns in ArcGIS Server Manager's Logs view, the Process ID is 460.  When I hop on that site and look at Task Manager (with the command line column visible), I can see task ID  460 defined this way:

Name: javaw.exe

PID: 460

Status: Running

User name: arcgis

CPU: (fluctuates between 0 and 20)

Command line: "C:\Program Files\ArcGIS\Server\framework/runtime/jre\bin\javaw"  -XX:+UseParallelGC -XX:MinHeapFreeRatio=40 -XX:MaxHeapFreeRatio=70 --add-exports=java.base/jdk.internal.misc=ALL-UNNAMED --add-exports=java.base/sun.nio.ch=ALL-UNNAMED --add-exports=java.mana

Description: OpenJDK Platform binary

I have verified my data stores and they all check out.  I can't read the IIS logs too well.  I'll try to update to 10.9.1 soon but I wonder why I get these every 5 minutes.