From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from hurricane.shaftnet.org (hurricane.shaftnet.org [135.148.100.103]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 17D283A8C1 for ; Thu, 31 Jul 2025 13:12:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=135.148.100.103 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753967565; cv=none; b=A1Gi3bUueZUZSnCUaoWRsB834dQ2B8P0vnwX5pUq0WBDUAGUwaJcUGORsk4kzTLVc6y3LmDypDqPbsH1tqS1cUg40HELvRhGdP0SScM5WX7z6sfjqd0Di8PgLWd81yncpABYBHXAyQ8vUPCAc02YKuMJhmt7YjSVcUjMGIDwTwo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753967565; c=relaxed/simple; bh=Crg2D9q/e8xYGAt6VcK6qSYbvv60crLR3z+czb7xu/E=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=O5CG6RcVpYOGFQKUgVEkok1cosjvcxAjpngObecOYLAAMIOBapzf06D1voO6zR6XV+xgE/5UKhaG00YZ4gLP8rLdYo4eKzaDfEbfBnmc6QwrsjI2BU0hzcKzzbEg357eWaAXgiVu62nQhK6jFGCkkyOjZIYxkHHt8EsSm4VRiUE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=shaftnet.org; spf=pass smtp.mailfrom=hurricane.shaftnet.org; dkim=pass (1024-bit key) header.d=shaftnet.org header.i=@shaftnet.org header.b=kLtVpnn8; arc=none smtp.client-ip=135.148.100.103 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=shaftnet.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hurricane.shaftnet.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=shaftnet.org header.i=@shaftnet.org header.b="kLtVpnn8" Received: from hurricane.shaftnet.org (localhost6 [127.0.0.1]) by hurricane.shaftnet.org (8.18.1/8.18.1) with ESMTPS id 56VCMjEc3690898 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Thu, 31 Jul 2025 08:22:45 -0400 DKIM-Filter: OpenDKIM Filter v2.11.0 hurricane.shaftnet.org 56VCMjEc3690898 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=shaftnet.org; s=default; t=1753964565; bh=Crg2D9q/e8xYGAt6VcK6qSYbvv60crLR3z+czb7xu/E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=kLtVpnn8o/GsyRxrGqX823Gd7PCY1ZymSVuzPxOpIRjSsNiuQ/bHluA+l38LyalMM u0YlduOhbhBaYBWkSlT5IHMd2Nx66kL5Zzj3ZGKhXzOrwPLvIWiSodrS85QPqxYsid zKViWF4LL4WCIn5KONEGkoZDJ0SgOlNgOx1lUtdI= Received: (from pizza@localhost) by hurricane.shaftnet.org (8.18.1/8.18.1/Submit) id 56VCMjYc3690897; Thu, 31 Jul 2025 08:22:45 -0400 Date: Thu, 31 Jul 2025 08:22:45 -0400 From: Solomon Peachy To: Dave Close Cc: printing-users@lists.linux.dev Subject: Re: CUPS and IPP strangeness Message-ID: References: <202507300615.56U6Feav3458581@d9020.compata.com> Precedence: bulk X-Mailing-List: printing-users@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="vfrRtaDzZFQenVjO" Content-Disposition: inline In-Reply-To: <202507300615.56U6Feav3458581@d9020.compata.com> X-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP * -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's * domain * 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily * valid * -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature * 0.0 T_DATE_IN_FUTURE_96_Q Date: is 4 days to 4 months after Received: * date --vfrRtaDzZFQenVjO Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jul 29, 2025 at 11:15:40PM -0700, Dave Close wrote: > E [29/Jul/2025:22:03:18 -0700] Returning IPP client-error-bad-request > for Send-Document (ipp://localhost:631/printers/PF0) from localhost >=20 > That sure look to me like CUPS is trying to send IPP traffic to this > printer. That certainly won't work, port 631 is not open on this printer. > I've restarted CUPS without effect. What can I do to fix this? To me this reads that something sent the _CUPS server_ a "bad" IPP=20 request; if it was talking to the printer via JD the URI would include=20 the printer's address/name ("pf0") instead of "localhost". > My major task on this network is to port it to a new system running a > much more recent OS. At this time, CUPS is running on CentOS 6 and is > version cups-1.4.2-81.el6_10.x86_64. I need to keep it running awhile > longer. I see no reason why you'd need to keep such an old CUPS version around;=20 as an example I currently have a CUPS queue talking to a Brother printer=20 via JetDirect with CUPS 2.4.x. It works more reliably than the=20 printer's native driverless IPP functionality.. - Solomon --=20 Solomon Peachy pizza at shaftnet dot org (email&xmpp) @pizza:shaftnet dot org (matrix) Dowling Park, FL speachy (libera.chat) --vfrRtaDzZFQenVjO Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEE3H5Sx9DyiyB5hnENrGLLO/XVulEFAmiLYBAACgkQrGLLO/XV ulGf4g//Sl+Ne1VrfVps7kxok/QmTwoDolWpalCRS938rWHzsGyHiSbWyVnMNIhJ k7Emm8xS5Seqz3LX1GWKjazm+57zweiSXe1YEEXIHwTuCL4CMymPxCkMxbXKv+vn 14o36+QDNTe0JAe1PRA4UMCrKmjadTTxn60y1ZVNbSdLONmzYhfv6d6ewrKRwV/w oiVmjHEUvoF9SXgz+ysnfrH64WjKC44ZkOb3eRrdgTepcN/CWXZTKEh6HLy4XIa8 Mr9+hl/xmSy6k4EEZR2KU+TFAXngGzBdDERypMHsFZoOiQXaciXhDNYKndXBAEU4 AHQ7cD/49TVRTyggMZ9bpB3ctL4gtPICwOGpz4x8LzQFN3Ethfw7UBiPwP0Ykxax Ng1NwVvibBnOotYJnlMdYwkp8ufLb8trs6qTy6n5vTEbic2U/aJiOHygf4pZNJ2C o/u6eSlDe3GHbQ5IYFaryljx4egIpHtdLIVK/muWNfdeco+e6AdA+LLdYVR2nBXO k8aKvA37Xe+n3T2qWc0Kfp4J863Cct96eQ9CiXzi8kuJV8xP0RNR1dzqu+OXvaK8 GnlMH4wo4gbBe3LabSA4Lpy6blfBzUy3nrjs1mafJUzC0Tr3XpUcp155DK13K1eU Fisv21WLjT0U1ThAopbqBNc00iNNTMaepOPv/cvd2R512EvV9lA= =njmI -----END PGP SIGNATURE----- --vfrRtaDzZFQenVjO--