Ok Yes this IS a common error message. I've read most of the posts, the entire OAuth beginner's documentation, registered my application, checked for capitalization , checked my system clock. So far, no luck As a base library I am using Sönke Rohde's open source Twitter library http://github.com/srohde/Twitter,
though might switch to Tweetr and see if I make better progress. This is my header GET /oauth/request_token? oauth_consumer_key=C4eEz9MqGy28wuCj8hJC4w&oauth_nonce=0020a00%2001&oauth_signature=gX9Uk20RF70D6sxljfvcIK4szr4%3D&oauth_signature_method=HMAC- SHA1&oauth_timestamp=1263675366 HTTP/1.1 Also , I am testing from the desktop at the moment so needing a proxy for security sandbox issues isn't a problem. Can anyone help with troubleshooting?