Unable to Analyze Invalid Beats Protocol Frame

[Advay]

Dears,

I’m currently troubleshooting an issue with my Logstash cluster and would appreciate some guidance.

I’m consistently seeing the following warning in the Logstash logs:

org.logstash.beats.InvalidFrameProtocolException: Invalid version of beats protocol: 71

To investigate this, I captured the network traffic using tcpdump on the Beats input port and attempted to analyze it in Wireshark. However, I’m unable to properly interpret the packets — they appear in binary format and I couldn’t successfully decode them as HTTP or any other readable protocol.

I also tried manually setting the protocol decoding in Wireshark to HTTP for the relevant port, but it didn’t help since Beats uses its own binary framing protocol, and the data remains unreadable.

Has anyone encountered a similar issue or have recommendations on how to effectively analyze Beats protocol traffic in Wireshark or identify the source of invalid frames?

Any suggestions or packet dissector recommendations would be greatly appreciated.

Thanks in advance!

[Rios]

I would say this sound like you have mixed HTTP and HTTPS connections.

Can you show us:

• output.logstash params from filebeat.yml how do you connect to LS and
• input { beats { ... from .conf? Need to see conn. params.
• FB and LS versions

No need for hostname, user/pass.

[stephenb (Stephen Brown)]

Closed as duplicates of

Logstash-output-elasticsearch Connection reset while trying to send bulk request to elasticsearch

@Advay Welcome to the community. Seems like this is perhaps a duplicate of the other topic. In short, for any of else to help we need the following: We need the beats output configuration The logstash input configuration The logstash elasticsearch output configuration Versions of all How did you install elasticsearch, and you curl the elatii endpoint If this is a duplicate of the other thread we will close that thread...