New answers tagged crawling
what you need, You have to give the read permission to default content access account on the Legacy system. This way it will index the data. http://technet.microsoft.com/en-us/library/dn178512(v=office.15).aspx http://technet.microsoft.com/en-us/library/ee792876(v=office.15).aspx
In addition to Crawler Impact Rules you can configure the crawler to use Anonymous Access. This can help crawling Windows servers running IIS that host the target web site.
This is most likely a permission issue. Can you log in with the default content access account and try whether you see results or not?
You can define crawler impact rules so you can reduce the load SharePoint will put on an external site. What type of content? Is this static HTML pages or something different? You may want to be sure your crawler is also configured to crawl complex URL's. You can also adjust the SharePoint crawler timeouts and retry events - but these are server settings ...
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