Try to unlink twitter account, and then add it again.

Thanks, but says after unlink and new link thats all ok, but dont work

Hmm, no other same problems like me?
Than i must look in server configuration.

Thanks

// Twitter params initialization
define( 'TWITTER_CONSUMER_KEY', 'z680vsCAnATc0ZQNgMVwbg' );
define( 'TWITTER_CONSUMER_SECRET', 'OBo8xI6pvTR1KI0LBHEkjpPPd6nN99tq4SAY8qrBp8' );

Teh error Message "Could not authenticate with OAuth " is from Twitter.

maybe this 2 defines?

Those are b2evo app credentials. They are not related to your account.

There must be something wrong with your server. I just tested the plugin and it works ok.

Thanks sam2kb. That helps.

After asking my hoster about the problem he says: oAuth is not installed. >:(

But did i need the install as an extension=oauth.so ?

The class is available in the folder twitteroauth in the twitterplugin.

After installation oauth.so from hoster i get the error message:
Fatal error: Cannot redeclare class OAuthException in /home/www/public_html/b2evolution/plugins/twitter_plugin/twitteroauth/oauth.php on line 9

I commented this off and the error is gone.
But other redeclares comes later.

So i commented extension=oauth.so in php.ini out

no tweet from b2evolution ...