Troubleshooting

• All URLs show "Page not found"
• Segments with aliases produce 404 errors

All URLs show "Page not found"

Typically this happen when rewrite rules in .htaccess do not work. This may happen due to several reasons:

• Your web server is not Apache. For example, Nginx does not support .htaccess. You have to make rewrites for Nginx yourself.
• You forgot to rename _.htaccess to .htaccess after installing TYPO3
• You have AllowOverride set to None for your site directory. Change it to All.

Segments with aliases produce 404 errors

Aliases is a RealURL feature that maps a record id value to a certain string. For example, it can map news record uid field to news title field. The URL will look like /path/to/news/article/how-i-earned-my-first-million. The last segment is an alias. RealURL will decode it to something like tx_mynewsext[news_id]=12345. To make such decoding RealURL needs to maintain association between the record table, record id and an alias. This association is stored in the tx_realurl_uniqalias table. If that table is cleared, RealURL will be unable to resolve aliases and corresponding extension may produce a 404 error.

Do not clear tx_realurl_uniqalias table in the database unless you really know why you do it.