Ethernet Shield, twittering

Hi there,

I have a problem with letting the arduino send tweets. I'm running a sketch with the Ethernert.h, EthernetDHCP.h, EthernetDNS.h and Twitter.h. The connection to the server seems ok, because I'm getting back a 403 Error. I'm not using usr:passw. I registered an application and use the token to authorize. From time to time I can send a tweet. But mostly I get this 403 error. Have you any suggestions why I get those errors?? What can I do to avoid this??

From http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html 10.4.4 403 Forbidden

The server understood the request, but is refusing to fulfill it. Authorization will not help and the request SHOULD NOT be repeated. If the request method was not HEAD and the server wishes to make public why the request has not been fulfilled, it SHOULD describe the reason for the refusal in the entity. If the server does not wish to make this information available to the client, the status code 404 (Not Found) can be used instead.

This suggests that there is more data that follows the status code.