Re: Install was successful but….
1. I use 1&1 and have no problems with them at all.
2. The issue you are having is likely due to a problem with mod_rewrite. Try changing your config so that you are not using pretty permalinks, and I think your forum will work.
# change this line to false, if you are using true
$bb->mod_rewrite = false;
Also, not sure what version you installed, but there’s a possibility it’s something else with slugs or something, but I think it’s due to mod_rewrite and .htaccess, pretty permalinks or Options MultiViews. Turn that off and I think you will find your forum works.