Hi Trond, Steven, eversince I switched from Debian Jessie to Stretch last summer, I've been seeing the very same hidden ports on an NFS server as described in , which is a follow-up to .
Your patch (, ) solved the issue back then. Later on, you changed that fix again in , which lead to the situation we're seeing today. Reverting 0b0ab51 fixes the issue for me. Let me know if you need more info. Thanks Daniel  https://lkml.org/lkml/2016/6/30/341  https://lkml.org/lkml/2015/6/11/803  https://lkml.org/lkml/2015/6/19/759  4876cc779ff525b9c2376d8076edf47815e71f2c  4b0ab51db32eba0f48b7618254742f143364a28d
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