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For example, try to validate URI http://ðîññèÿ.ðô/ You will get an error: 500 Can't connect to xn--aca0d8k7a0jdddbd.xn--ai3ub:80 (Bad hostname 'xn--aca0d8k7a0jdddbd.xn--ai3ub') But the proper punycode transcript for ðîññèÿ.ðô domain is xn--h1alffa9f.xn--p1ai.
*** This bug has been marked as a duplicate of bug 11627 ***