Gamechanger

By the way, http://www.epicase.de/wp-login.php redirects me to http://epicase.de/wp-login.php – That’s exactly what I was talking about 🙂

King.

Did you map both www and non-www domains? Which did you set as primary?

I did answer this before. I do not know where to map domains. Can you please give more concrete advice, such as “open this or that file, change this or that function”?

Yes, it changes the domain, if I put www. before to without any prefix (at FF 20.0). So they both work.
BUT, the second site page http://www.secondsite./xx redirects to the homepage of the first site http://www.firstsite.de

If you mean “I go to the login screen and enter my username and password, but the screen just refreshes without a message, not logging me in”is a good description, then take this as a description what`s happening on my site, when I try to log in.

I have read on the German WP forum that they solved this same issue (at the same hoster btw) by adding the www. on the “domain mapping” and dropping it on the preferences site under WP network. I dont know exactly what is meant by "domain mapping" in this case, but I did also drop the www. on the network preferences (except on the first domain) but this doesnt changed any.

I also dont know whats the “correct” .htaccess. If I would know that, I could say this is not the problem. It just looks like this:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

Any advice!?

Yes, I deleted all cookies and also tried it with different browsers.
There is no special error message. It is just the case that I I have ether a redirect from any undersite when define('SUBDOMAIN_INSTALL', false);
or having trouble with login when define('SUBDOMAIN_INSTALL', false);

Thanks for answer Andrea,

the thing was, that I meanwhile deleted the >define(‘WP_ALLOW_MULTISITE’, true);< out of my config, so that I had no network option.

In case of the hidden .htaccess file, I wasn`t able to change it over any ftp-app under any function. I had to do that over the servers advanced options.

No it`s solved so far.