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503 – Service Unavailable when requesting element log files

Solved1.76K views10th July 2023HTTP error logging
0
Ruben Vandepitte [SLC] [DevOps Advocate]2.32K 4th August 2020 0 Comments

What could cause a ‘503 – Service Unavailable’ HTTP error when requesting element log files? On one of our systems, we are facing this error for all elements, also when directly browsing to the log file URL while being logged in to the DataMiner server which is hosting the element.

The problem persists after restarting both IIS and the DataMiner Agent.

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 10th July 2023

2 Answers

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Wim Bruynooghe [SLC] [DevOps Advocate]6.59K Posted 4th August 2020 2 Comments

This could be caused by many reasons, most likely a configuration/installation issue. To find the root cause, this has to be further investigated:

  • Does it show this error only when accessing viewlog.asp, or also when opening other web pages, for example Reporter?
  • In Windows’ Roles and Features, is “ASP” installed?
  • Are there more error details in the logging of IIS? (C:\inetpub\logs\LogFiles)
  • Are there any related errors in the logging of Windows?
Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 10th July 2023
Ruben Vandepitte [SLC] [DevOps Advocate] commented 4th August 2020

Thanks Wim.

– Reports and Dashboards ASP pages are opening up fine.

– ASP has been installed

– IIS logs the GET requests to open the URL, but all looks clean there. No error messages

– Windows Event Log looks pretty clean. No obvious errors.

Note that this is occurring for every DMA in the cluster (recent clean installs on Windows Server 2019).

Wim Bruynooghe [SLC] [DevOps Advocate] commented 4th August 2020

Then it could be an issue with:

– The SLAuthFilter ISAPI filter. You could temporarily remove this ISAPI filter from IIS Manager, but don’t forget to add it back as otherwise it exposes several webpages as it removes the authentication checks.
– The virtual directory “logging” might not work correctly. Could be tested by requesting a log file via the url: http://localhost/logging/sldataminer.txt

0
Bert Vandenberghe [SLC] [DevOps Enabler]8.29K Posted 4th August 2020 1 Comment

Is this happening on a Windows Server 2016 Version 1709?

If so, this KB of Microsoft might help you out: https://support.microsoft.com/en-us/help/4050891/error-http-503-and-was-event-5189-from-web-applications-on-windows-10

Ruben Vandepitte [SLC] [DevOps Advocate] Posted new comment 4th August 2020
Ruben Vandepitte [SLC] [DevOps Advocate] commented 4th August 2020

Thanks Bert.
This is happening on a Windows Server 2019 (clean DMA install).
Just to be sure, I removed the temp files described in the linked KB article, but saw no change afterwards.

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