Splunk® Enterprise

Securing Splunk Enterprise

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Splunk server tokens

If a forwarder TCP token is corrupt or rejected, the indexer that receives the token generates error messages in its logs. If you do not locate the bad token, that forwarder tries to use it indefinitely.

To locate the bad forwarder token, increase the logging level of the indexer:

  1. Open a shell prompt.
  2. Using a text editor, edit SPLUNK_HOME/etc/log.cfg as follows:
    category.TcpOutputProc=DEBUG
    category.TcpInputConfig=DEBUG
    category.TcpInputProc=DEBUG
    
  3. Save the file and close it.
  4. Restart the indexer.

When a token that a forwarder sends matches the token that the indexer receives, the following messages are generated:

Indexer:

09-15-2015 13:21:30.746 -0700 DEBUG TcpInputProc -  Forwarder token matched

Universal Forwarder:

09-15-2015 13:24:00.343 -0700 DEBUG TcpOutputProc - Indexer 
can use tokens

When the tokens do not match, the indexer generates a message similar to the following:

09-15-2015 13:22:01.747 -0700 ERROR TcpInputProc - Exception:  Token not sent by 
forwarder src=10.140.126.58:51838! for data received from src=10.140.126.58:51838

09-15-2015 13:52:14.803 -0700 ERROR TcpInputProc - Exception:  Token sent by 
forwarder does not match configured tokens src=10.140.126.58:51990! 
for data received from src=10.140.126.58:51990
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This documentation applies to the following versions of Splunk® Enterprise: 6.5.0, 6.5.1, 6.5.1612 (Splunk Cloud only), 6.5.2, 6.5.3, 6.5.4, 6.5.5, 6.5.6, 6.5.7, 6.5.8, 6.5.9, 6.5.10, 6.6.0, 6.6.1, 6.6.2, 6.6.3, 6.6.4, 6.6.5, 6.6.6, 6.6.7, 6.6.8, 6.6.9, 6.6.10, 6.6.11, 6.6.12, 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.0.4, 7.0.5, 7.0.6, 7.0.7, 7.0.8, 7.0.9, 7.0.10, 7.0.11, 7.1.0, 7.1.1, 7.1.2, 7.1.3, 7.1.4, 7.1.5, 7.1.6, 7.1.7, 7.1.8, 7.1.9, 7.2.0, 7.2.1, 7.2.2, 7.2.3, 7.2.4, 7.2.5, 7.2.6, 7.2.7, 7.2.8, 7.3.0, 7.3.1, 7.3.2


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