please make sure you have the latest version of the plugin (1.3.4). Also if you could provide some php error because without more details I can’t think of anything. This isn’t a known issue we have.
I have the latest version, and I have no error messages, I’ve tested it on two sites hosted on 1and1 and it does the same thing … : When I click “Authorize this facebook account” worpress it disconnects me and asked me my password wp-admin
I tested two other known sites hosted by OVH, and then it works perfectly … This is certainly a problem with 1and1 but I do not see that at all …
When authorizing fb accounts you have 2 steps. First one is to log in into your fb account (if not already) and authorize the app and then you’re redirected to microblogposter’s settings page.
Do you successfully pass the first step? Log out from fb and retry.
I guess you have the error when you’re redirected to settings page.
Also try disabling any other plugins and retry, maybe it’s a conflict with some other plugin. Yeah it could be also some php function that is disabled on 1and1 and that is used when you’re redirected.