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Question

Error communicating with FME Server host localhost

  • March 17, 2026
  • 2 replies
  • 77 views

lenabagh
Contributor
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Hello community,

for a few days, I have been struggling with our FME Flow. It occasionally throws

and 

I am the admin, I asked myself and… crickets.

The only change we did recently is a Python library install.

FME Flow gets in this error communicating state and then recovers. We tried restarting FME Flow, it likely made some difference (I am not sure whether it indeed fixed the problem even for a short period of time as FME Flow works between these messages anyway), but it didn’t last.

This is FME Flow 2024.0 build 24612.

Any ideas will be much appreciated.

Thank you :)

2 replies

lenabagh
Contributor
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  • Author
  • Contributor
  • March 17, 2026

Apparently, there is more in the error message. It’s hard to read white on almost white, so here is a pink version: 

 


carlw
Safer
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  • Safer
  • April 7, 2026

Hi Lena, 


I hope you’ve managed to make some progress on this! Since the only recent change preceding this error was that Python library install, that would be my first suspect - it is possible for a library installed into the system python (or one that modifies the PYTHONHOME variable) to interfere with the interpreter used by Flow engines, leading to engine crashes and intermittent connection issues. I’d try temporarily removing that library to see if the error disappears.

To dive a bit deeper, I would look at fmeprocessmonitorengine.log for engines dropping unexpectedly or python-related crash messages. On the off chance that this is a port conflict unrelated to the python install, it would also be worthwhile checking the queue logs for memurai binding errors. 


If none of this yields any progress, we can always tackle this in a support ticket!

Best,

Carl