Daniel Huhardeaux <tech@xxxxxxxxxx> writes: > I created a bash script under Debian/Buster to create nft rules: it > works perfectly. > > Now I copy this script to a Debian/Stretch machine (nftables v0.7.0) > and get in troubles to make it work: at some point I receive the > subject error. > > OK, I think it's a version problem: I installed nftables from Stretch > backports which is the same version as the Buster one, v0.9.0 But > bang, error is still here :( > > What can be the cause of this error? Yes, I use sets, and no, they are > no maps defined. Can you show us your actual ruleset.nft? Or (better yet) distill it down to a minimal test ruleset.nft that generates the problem, and show us that. I don't recognize the specific error. I have seen similar errors before due to brainos in my ruleset. I agree it doesn't make sense that the same version (nftables=0.9.0 on Debian 9 and Debian 10) should parse the same way - so maybe it's a difference on the kernel side? Are you running 4.19.67-2+deb10u1~bpo9+1 on Debian 9, and 4.19.67-2 on Debian 10?