Have trouble shorting some link's in ping.fm ...

Posting with ping.fm some link's are not shorting or broken, and sometimes get short link but don't work :-(.

Example this link:
http://sdpnoticias.com/sdp/contenido/...
Ping.fm don't short this, i get broken link, you can se here:
http://twitter.com/tuxsoul/status/521...

And this type of link's:
http://www.alcancelibre.org/article.p...
Sometimes ping.fm short this, but get a broken short link :-(.

To post this link's using ping.fm i need use tinyurl or bit.ly before.
Can you check please :-).