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I'm running EVE-NG version 2.0.6-34-PRO.

I have a lab running 5 IOL Layer3 images, version 15.4.2T4.
When I initially built the lab, I could save and export my configs. At some point, two of the routers lost the ability to write their configuration files.
I get "% failed to write configuration file[OK]" when trying to write the config file. As a result, I cannot export updated configurations. This only happens on two of the 5 routers.

Any thoughts on what might be causing it?

Thanks,
David

Usually such not happening.
try fresh lab addd IOL node, do not chand it settings, and configure node,
wr
export

i fixed it with /opt/unetlab/wrappers/unl_wrapper -a fixpermissions