Troubleshooting

• [Segments with aliases produce 404 errors](#Segments with aliases produce 404 errors)

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.