, I also faced similar issue. '/system/console/slinglog'...

[monikam6817093]

HTTP ERROR: 500  Problem accessing /system/console/slinglog.

Reason:      Server Error

Can you suggest the steps to fix the issue.

[kautuk_sahni]

Some Quick try:-

1. Restart instance.

2. Restart "org.apache.felix.webconsole.plugins.ds" bundle

When and where are you getting this error? Is this happening only on a single instance or is throughout all your instances?

~kautuk

[monikam6817093]

We are facing this issue in PROD Author server.

[Jitendra_S_Toma]

monikam6817093 wrote...

HTTP ERROR: 500  Problem accessing /system/console/slinglog.

Reason:      Server Error

Can you suggest the steps to fix the issue.

It isn't the case in my local. provide more details please.

[GK-AEM]

Please share exact error message from error.log file.

-Kishore

[MrynalKumar]

@monikam6817093 , I also faced similar issue. '/system/console/slinglog' was not getting loaded. 

Error Log -

07.04.2020 10:12:45.297 *ERROR* [qtp1407899993-6020] org.apache.felix.http.jetty Exception while processing request to /system/console/slinglog (java.lang.NullPointerException)

java.lang.NullPointerException: null

        at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)

        at org.apache.sling.commons.log.logback.internal.LogConfigManager.getLogWriter(LogConfigManager.java:223) [org.apache.sling.commons.log:5.1.10]

Reason - 

• As error log suggests some of the key/value in the Logger configuration is missing/null. 
• 'org.apache.sling.commons.log.level'  Log level for the error.log is not correctly configured. Also there were multiple error log configurations

Fix -

• Delete all the duplicate unwanted error.log
• Reconfigure the log level
•