When trying to deploy a proxied IBI cluster from RHACM 2.15/MCE 2.10 running on OCP 4.20, it fails if the seedimage is from a <4.20 release.

The LCA running on the seed image will fail with the following log:

Dec 10 17:42:36 super1-randu4 lca-cli[132815]: time="2025-12-10 17:42:36" level=error msg="failed to set no proxy: machineNetwork is empty, must be provided in case of proxy"
Dec 10 17:42:36 super1-randu4 lca-cli[132815]: time="2025-12-10 17:42:36" level=fatal msg="Post pivot operation failed"


From some investigation we can see that LCA in 4.18 was checking machineNetwork and in 4.20 it checks machineNetworks.

This looks like a race condition when using proxy. The new components on the hub write machineNetworks to the config iso , but the lca running on the seed image only checks for machineNetwork.


machineNetwork in 4.18: https://github.com/openshift-kni/lifecycle-agent/blob/release-4.18/lca-cli/postpivot/postpivot.go#L340-L342

machineNetworks in 4.20: https://github.com/openshift-kni/lifecycle-agent/blob/release-4.20/lca-cli/postpivot/postpivot.go#L378-L380


This has been discussed in the following slack thread:
https://redhat-internal.slack.com/archives/C05JHD9QYTC/p1765462379583519

   4.20

    Always

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    SNO IBI proxied deployment with seed images running LCA 4.20 fails

 SNO IBI proxied deployment with seed images running LCA 4.20 works