When I try to checkout this project :
https://src.springframework.org/svn/spring-samples/mvc-ajax/trunk/
I receive the error :

‘src.springframework.org’ is a valid hostname so what am I doing wrong ?
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Tortoise is misconfigured.
I tried the command : svn checkout https://src.springframework.org/svn/spring-samples/mvc-ajax/trunk/ , and it works perfectly well.
How did you configured tortoise?
Yuo can try my command with putty, for example.
edit : Your hostname is not root or something else ?