TYPO3 Core

Can someone please move this to the right project if tx_rtehtmlarea is wrong? I didn't see that drop-down in the upper right corner.

Did you try to adjust your genaral TypoScript by config.typolinkCheckRootline?
see http://typo3.org/documentation/document-library/references/doc_core_tsref/4.0.0/view/7/3/

Yes. I've tried enabling it both in my tsconfig and in my template (wasn't sure if this was backend or frontend). No change.

I have the same problem.
config.typolinkCheckRootline works with internal links, but it cannot write REALURL links.
If I set an external link to http://www.beispiel.de/test.html RTE htmlArea writes in the database <link test.html>Test</link> . If the link is changed without htmlArea to <link http://www.beispiel.de/test.html >Test</link> everything is fine.
In wonder why htmlArea changes an external URL?

Oh there is a thread on the typo3-project-rte mailinglist:
http://lists.netfielders.de/pipermail/typo3-project-rte/2006-April/000545.html, which belongs to that question. Stanislans Rolland says, that there is no difference between internal and external links... ?

I ran into the same problem but found a work around and possible a way to solve this. The URL being saved into the database depends on the URL of you're back-end. If you log in to the Typo3 backend from the domain the site belongs to, it's working fine. Edit content on www.sub.com from www.sub.com/typo3 and content for www.main.com from www.main.com/typo3. You're always in the same backend but the external URL's being generated (to www.main.com and www.sub.com) are now correct.

When generating links to an external website, HTMLArea seems to look at the URL of the backend to determine whether it's a link to an external site or not. HTMLArea should look at the domain records in the root of the page tree instead.

Same problem, work around works..

excactly the same problem here. workaround works but that's not very nice. is this bug ever gonna fixed?

This is a duplicate of #9455.