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p.s. One thing I neglected to mention is the need to determine the site addresses for content providers such as Syndetics, and to add them to the system's local hosts file; otherwise, there will be missing content and placeholders hither and yon. Dealing with Google is a challenge, as I can't very well whitelist google.com, but everyone is so fond of Google analytics, fonts, APIs, etc, that sometimes it comes down to a trade-off between a good experience/appearance and security. John Lolis Coordinator of Computer Systems 100 Martine Avenue White Plains, NY 10601 tel: 1.914.422.1497 fax: 1.914.422.1452 https://whiteplainslibrary.org/ *“I would rather have questions that can’t be answered than answers that can’t be questioned.”* — Richard Feynman <https://click.fourhourmail.com/5qure95xkf7hvvo93wh2/7qh7h8h05vr4zrtz/aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvUmljaGFyZF9GZXlubWFu>, theoretical physicist and recipient of the Nobel Prize in Physics in 1965 On Mon, 26 Feb 2024 at 19:07, Lolis, John <[log in to unmask]> wrote: > Wow. Thanks so much, Kaleb. I started looking into modifying that xhtml > file, and found those waters I waded into to be quite deep. I only got so > far, but I came across mention of code signing that one would come across, > and how that security makes it difficult to make modifications. With my > time being at such a premium these days, I decided to go with the more > expedient solution, that is, to set up a proxy server with at least one > custom error page. > > Since we already use pfSense here, it didn't take much to find the path to > the Squid proxy error pages. If anyone is interested, the English language > ones can be found here (many more languages are available from up one > level): /usr/local/etc/squid/errors/en > > Below is a quick-and-dirty page I came up with. The file is > /usr/local/etc/squid/errors/en/ERR_DNS_FAIL. I thought of having an > automatic redirect, but I think it's better to require some interaction. > > Thanks so much once again to everyone for their suggestions! > > [image: image.png] > > > John Lolis > Coordinator of Computer Systems > > 100 Martine Avenue > White Plains, NY 10601 > tel: 1.914.422.1497 > fax: 1.914.422.1452 > > https://whiteplainslibrary.org/ > > *“I would rather have questions that can’t be answered than answers that > can’t be questioned.”* > — Richard Feynman > <https://click.fourhourmail.com/5qure95xkf7hvvo93wh2/7qh7h8h05vr4zrtz/aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvUmljaGFyZF9GZXlubWFu>, > theoretical physicist and recipient of the Nobel Prize in Physics in 1965 > > > On Thu, 8 Feb 2024 at 17:39, Sove67 <[log in to unmask]> wrote: > >> Hi John, >> >> Barring a more elegant solution, you could edit the .xhtml file that >> Firefox redirects to when it reaches a net error (you can view this by >> visiting the following "url" using firefox: >> *about:neterror?e=dnsNotFound*). >> >> The accepted answer here >> < >> https://superuser.com/questions/1792996/customize-file-not-found-page-in-firefox-114 >> > >> explains where to find that .xhtml file, inside the omni.ja archive. >> >> I've attached a custom omni.ja archive you could inject, and examples of >> how it displays now vs how it used to display. If you plan to use this, >> please save a copy of the original omni.ja file that you need to >> overwrite! >> omni.ja >> < >> https://drive.google.com/file/d/1aExDyrFxdE0svkRZELAA2Zg03PHXtnwo/view?usp=drive_web >> > >> [image: Example.PNG] >> [image: image.png] >> >> Best of luck, >> Kaleb A. (Langara LIT Student) >> >> On Thu, Feb 8, 2024 at 1:10 PM Lolis, John <[log in to unmask]> >> wrote: >> >> > Prithee, might one of you be able to point me in the right direction >> with >> > regard to modifying a browser error message, specifically a DNS >> error/site >> > not found message? >> > >> > Here's the rub... in an effort to prevent use of our OPACs as public >> access >> > computers, I've modified their DNS settings so that they only look to >> > themselves for DNS queries. In their hosts file, I only added entries >> for >> > our catalog, our website and our museum pass reservation site. >> > >> > So this effectively prevents access to all other sites (unless of course >> > someone happens to know the IP address of another site). >> > >> > The problem is that the browser returns the DNS error/site not found >> > message, and there are no browser controls to go back since it's in >> kiosk >> > mode. We have a label advising patrons to press ALT← to go back to the >> > previous page, but what I'd like to do is use a hex editor to modify the >> > default browser error to communicate the same thing. >> > >> > So my question is, does anyone know where I can find those messages so I >> > can edit them? I've searched all sorts of Firefox files to no avail so >> > far. I'm not completely averse to using a different browser, although >> my >> > preference is to *not* use Chrome or Edge. >> > >> > I also realize that whatever string I replace the error message with, it >> > must be the same length (this brings back memories of working at Prodigy >> > and editing command.com in MS-DOS so that it would return Bad command, >> you >> > idiot!!). >> > >> > hmmm... as I write this, now I'm thinking of utilizing a redirect page >> of >> > some sort, one that displays advice to the patron, then returns to >> > wherever. >> > >> > Thanks much! >> > >> > John Lolis >> > Coordinator of Computer Systems >> > >> > 100 Martine Avenue >> > White Plains, NY 10601 >> > tel: 1.914.422.1497 >> > fax: 1.914.422.1452 >> > >> > https://whiteplainslibrary.org/ >> > >> > *“I would rather have questions that can’t be answered than answers that >> > can’t be questioned.”* >> > — Richard Feynman >> > < >> > >> https://click.fourhourmail.com/5qure95xkf7hvvo93wh2/7qh7h8h05vr4zrtz/aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvUmljaGFyZF9GZXlubWFu >> > >, >> > theoretical physicist and recipient of the Nobel Prize in Physics in >> 1965 >> > >> >