Splunk Syslog forwarder is not sending log to Indexer

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Updated:September 29, 2026
Document ID:SPLK045253

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Applicability

Splunk Enterprise

Description

Splunk topology:
Logs from all network devices, get forwarded to two Universal Intermediate Forwarders which then send them to On-Prem Indexers and further forwarded to another Forwarder hosted outside.

There is a queue blockage issue on the Universal Forwarder (UF). 

The file props.conf is configured on the UFs.


Investigation

props.conf can never be configured on the UF, however, UF doesn't have parsing capabilities hence the performance/queue blockage issues.
 

Which Splunk servers go with which phases

Here are how some common Splunk server configurations correspond to these phases:

Universal/Light Forwarder?Indexer
Input?Parsing, Indexing, Search
======================================================
Heavy Forwarder?Indexer
Input, Parsing?Indexing, Search
======================================================
Universal/Light Forwarder?Indexer?Search Head
Input?Parsing, Indexing?Search
======================================================
Universal/Light Forwarder?Heavy Forwarder?Indexer
Input?Parsing?Indexing, Search
======================================================
Universal/Light Forwarder?Heavy Forwarder?Indexer?Search Head
Input?Parsing?Indexing?Search

 


Resolution

Moving the props.conf from Universal forwarder to Indexer resolved the queue blockage.


Splunk Community
Why is Universal Forwarder unable to process props.conf configuration for structured data?
Why-is-Universal-Forwarder-unable-to-process-props-conf

Splunk Wiki
Where do I configure my Splunk settings?
Where_do_I_configure_my_Splunk_settings

Revision History

Revision Publish Date Comments
1.0
29-Sep-2026
Initial Release

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