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bjett_224741's avatar
bjett_224741
Icon for Altostratus rankAltostratus
Jan 20, 2017

Ltm Pool Monitor Down Clarification "Tcp read:" vs "Unable to Connect;"

Had simple http monitor fail on multiple servers the error on one server was different from the other 5: The difference is minor the one server says:

 

"Tcp read: Connection refused; Unable to connect; No successful responses received before deadline."

 

VS the other 5 say:

 

"Unable to connect; No successful responses received before deadline."

 

I have a theory on what the difference is but cannot find any official documentation on it. Can anyone help clarify.

 

application delivery
BIG-IP
LTM
  • IheartF5_45022's avatar
    IheartF5_45022
    Jan 20, 2017

    I would assume a RST is received from member after handshake completed, and after request sent to member.

     

  • IheartF5_45022's avatar
    IheartF5_45022
    Icon for Nacreous rankNacreous
    Jan 20, 2017

    I would assume a RST is received from member after handshake completed, and after request sent to member.

     

    • bjett_224741's avatar
      bjett_224741
      Icon for Altostratus rankAltostratus
      Jan 23, 2017

      That is kind of what I thought. The issue we were having that day was high load and Max Workers on apache. All the servers that had this except one had the: "Unable to connect; No successful responses received before deadline." which is the most common one. The monitor down messages from the one server were all "Tcp read: Connection refused; Unable to connect; No successful responses received before deadline." and I assumed it was a monitor timeout failure after the handshake.