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ERROR_IPSEC_IKE_PROCESS_ERR_TRANS
ERROR_IPSEC_IKE_PROCESS_ERR_TRANS means a transform in the peer proposal could not be processed. A transform identifies algorithms and modes used for protecting the SA.
The rejected transform identifies a narrower compatibility problem than a general SA failure. Preserve the transform identifiers and compare them with the effective algorithm policy on both endpoints before changing unrelated tunnel settings.
What to check
- Compare encryption, integrity and Diffie-Hellman choices in the effective policy on both peers.
- Check whether one peer requires algorithms that the other peer does not support.
- Inspect the captured proposal instead of inferring compatibility from a general VPN setting name.
Microsoft: Use Netsh to manage network traces
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