All of the external links on the www.sljfaq.org pages have been checked, and most of them have been corrected. The remaining unchecked ones are links to a university server, meijigakuin.ac.jp, which seems to be partly down, and links to old sci.lang.japan posts on Google Groups, where the old link was replaced with a new format which is not using the same ID numbers, so needs to be individually changed.
I've done quite a lot of work on updating the links, such as changing from http to https where necessary. Some sites such as the kanken dictionary site moved their URL with redirects, and some of the Japanese government sites moved their URL without redirects. Here are some notable things which changed:
The domain jeKai.org seems to have disappeared from the internet around January 2020. There were five links from various FAQ pages to jeKai's pages, which are now links to the pages on archive.org.
I've removed a link to "the Japan Channel" forum since it seems to be defunct; the login page shows nothing and the last forum posts seem to be from several years ago.
I've removed kanjidamage.com, I'm not too surprised this site has disappeared, as has jgram.org, a user-contributed grammar site.
I probably should never have linked to either of these sites, since it was clear they were destined to burn out after a short while after the people who made them got bored of them.
The links to www.csse.monash.edu.au are now all going to nihongo.monash.edu.
The 和製漢字の辞典 page seems to have gone out with the whole of the nifty.com domain, and there is no archive.org link due to nifty.com having blocked it.
For some reason the tofugu page
is redirected to a page about onyomi now, so I've linked to an archive.org copy of the original article.
I've turned the script for updating links into a CPAN module, WWW::LinkRot.
I used lemoda as a testbed for the above CPAN module and fixed up some of the old links from lemoda.net.
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