Hi,
if I try to send a trackback to a blog on wordpress.com I get this error:

Sende Trackback an: http://ednong.wordpress.com/2015/07/10/hinweis/trackback [post]
Antwort: Keine gültige Trackback-Antwort. Vielleicht ist die angegebene URL keine Trackback-URL. "HTTP/1.1 301 Moved Permanently Server: nginx Date: Sat, 05 Dec 2015 16:39:14 GMT Content-Type: text/html Content-Length: 178 Connection: close Location: https://ednong.wordpress.com/2015/07/10/hinweis/trackback X-ac: 1.fra _dfw 301 Moved Permanently 301 Moved Permanently nginx "

This means:
Send trackback to: ...
Answer: No valide trackback answer. Maybe the url is not a trackback url. "HTTP ...

I don't know if this would work the target server will work only with http and not with https. I got trackbacks to my b2evo blog from a wp blog - this direction will works. On the target wp blog there are trackbacks enabled and the discussion setting too, so trackbacks and pingbacks are allowed there. Trackbacks from wp blogs will work fine there - so there is the question:
Is this an error on b2evolution or on wp? How I can solve it?