From owner-freebsd-questions@FreeBSD.ORG Thu Jan 10 23:14:49 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 4BAD786D for ; Thu, 10 Jan 2013 23:14:49 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (agora.rdrop.com [IPv6:2607:f678:1010::34]) by mx1.freebsd.org (Postfix) with ESMTP id 1FB56F61 for ; Thu, 10 Jan 2013 23:14:49 +0000 (UTC) Received: from agora.rdrop.com (66@localhost [127.0.0.1]) by agora.rdrop.com (8.13.1/8.12.7) with ESMTP id r0ANElME019773 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Thu, 10 Jan 2013 15:14:47 -0800 (PST) (envelope-from perryh@pluto.rain.com) Received: (from uucp@localhost) by agora.rdrop.com (8.13.1/8.14.2/Submit) with UUCP id r0ANEluR019772 for freebsd-questions@freebsd.org; Thu, 10 Jan 2013 15:14:47 -0800 (PST) (envelope-from perryh@pluto.rain.com) Received: from fbsd81 ([192.168.200.81]) by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407) id AA05683; Thu, 10 Jan 13 15:09:59 PST Date: Thu, 10 Jan 2013 15:09:58 -0800 From: perryh@pluto.rain.com (Perry Hutchison) To: freebsd-questions@freebsd.org Subject: bogus "No protocol specified" message Message-Id: <50ef3c36.DOThr42hGxWWeg6h%perryh@pluto.rain.com> User-Agent: nail 11.25 7/29/05 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Jan 2013 23:14:49 -0000 When trying to open an X application on a remote display, I am getting No protocol specified Error: cannot open display: 192.168.200.61:0 The "No protocol specified" message is bogus: the display is specified correctly*, and the same operation -- with exactly the same setting of DISPLAY -- was working yesterday. There's no problem with network connectivity between the two systems: ping and rlogin both work in either direction, and the specified X server is running and accepting connections. What does that message actually mean, and how do I fix it? * According to the X manpage, a non-empty hostname or IP address, separated from the display number by a single colon, specifies the use of TCP/IP communication protocol. BTW I get the same result using either the {ipaddress}:0 or the {name}:0 notation, and with or without a trailing .0; 192.168.200.61:0.0 and 192.168.200.61:0 both fail in the same way.