Hi Manolis!
Would you give more details? Do you try to point your subdomain to oxwall? What did you do for this?

Thank you for your answer!

I would like my oxwall website to run on a subdomain of my root domain. Firstly I installed oxwall in a subfolder called ../community/. Then I set up a subdomain community.my-domain.com through my host provider's cp pointing that folder and when I called community.my-domain.com I got a 500 error.
After that I changed this line
define('OW_URL_HOME', 'http://www.my-domain.com/community/');
to
define('OW_URL_HOME', 'http://community.my-domain.com/');
in config.php file but I got the same error.

Then I added the line
RewriteCond %{REQUEST_URI} !www.my-domain.com/
or
RewriteCond %{HTTP_HOST} !www\.my-domain\.com$
in .htaccess file but the same error again.
I also removed completely the installation and made it once again from scratch this time in the subdomain but once again I got the same error.
I was worried cause nothing seemed to have an affection. What Do I do wrong?
I remind you that other subdomains of my domain work right!

Thank you!

Would you check in apache error logs, what exactly error gives apache this this subdomain?

Hi. I have same problem. I want to know, what happen if .htaccess remove?

Well, I moved on a little bit.
I changed first
define('OW_URL_HOME', 'http://www.my-domain.com/community/');
to
define('OW_URL_HOME', 'http://community.my-domain.com/');
in config.php file.

Then I renamed .htaccess file to .htaccess.txt and site worked fine so I relized that the problem was there.
Then following another topic here I added the line
RewriteCond %{REQUEST_URI} !^/community/
right after line
RewriteRule (.*) /http-bind [L]
in .htaccess file, uploaded it again and it worked but I could not login. When I make this change while I am logged in everything works just fine so it seems that there is a login problem with this.
Any suggestions what can I do now??

So, you site works well without .htaccess? This is impossible Sir :) Or you put back .htaccess file?

:( I read it in my host provider's help guide here:
http://community.godaddy.com/help/article/1655
I also checked website again and works fine without it. I just wanted to repair it so that I have no issues later.