Why SE won't index this?

[Ben]

Do you have robots.txt blocking anything on the server?

I put this robots.txt about one month ago:

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User-agent: ia_archiver
Disallow: /
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it's intended to disallow the webarchive robot (archive.org). I've seen it on many sites (e.g. Ugas and Mancheck) and it shouldn't affect other search engines. I don't think this has any effect on Google, because the warning page was introduced about 3 months ago, and that's when normal indexing stopped.