On Fri, 18 Apr 2025 at 03:10, Andrew Zaborowski <andrew.zaborowski@xxxxxxxxx> wrote: > version is 4.1 or higher. This attribute was apparently defined in > RFC9754 as an extension to v4.2, never valid in v4.1, but it is neither > valid for use in OP_GETATTR. My bad, re-reading the specs this is wrong. As long as an attribute is not Required in v4.1 the v4.1 server shouldn't have returned an error. I need to look at the specific server. Please ignore this message and sorry for the noise. Best regards