From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pascal Hambourg <pascal@plouf.fr.eu.org>
Subject: Re: iptables: unknown protocol "!" specified
Date: Sun, 22 Nov 2015 09:18:56 +0100
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To: Roger Price <roger@rogerprice.org>
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Roger Price a =E9crit :
>=20
>   Explanation ... This match can also be inversed with the !
>   sign, so --protocol ! tcp would mean to match UDP and ICMP.

No, it means to match anything but TCP. There are many other protocols
than TCP, UDP and ICMP.