web server is not rewriting URLs correctly

Subdomain currently just supports 2-level domains out of the box (e.g. example.com).

To support base domains with 3 levels like yours, open your .htaccess file and scroll down to the following section added by the htaccess patch:

  # REQUIRED BY SUBDOMAIN.MODULE
  # Moves subdomain to URI path
  # e.g: mysubdomain.example.com 
  # becomes example.com/index.php?_mysubdomain/
  # NOTE: does not rewrite subdomain if it is "www". 
  # If you want it to rewrite www, disable the 2nd line
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{HTTP_HOST} !^www\.([^.]+)\.([^.]+)$
  RewriteCond %{HTTP_HOST} ^([^.]+)\.([^.]+)\.([^.]+)$
  RewriteRule ^(.*)$ index.php?q=~%1/$1 [L,QSA]

Change the 2nd and 3rd RewriteCond statements to the following:

  RewriteCond %{HTTP_HOST} !^www\.([^.]+)\.([^.]+)\.([^.]+)$
  RewriteCond %{HTTP_HOST} ^([^.]+)\.([^.]+)\.([^.]+)\.([^.]+)$

Give that a try and let me know how it goes.

No problem :-).

Glad you were able to get it working

$cookie_domain in settings.php - Not yet set

Drupal	6.4
PHP	5.2.6
PHP register globals	Off. 
MySQL	4.1.22
Apache/1.3.37 (Unix) mod_gzip/1.3.26.1a PHP/5.2.6

DNS server - show/hide details	Working
test-1.subdomain.domain.com successfully resolved to 
test-2.subdomain.domain.com successfully resolved to 
test-3.subdomain.domain.com successfully resolved to 

Web server - show/hide details	Working
HTTP request to http://subdomain-test.subdomain.domain.com/subdomain/test returned the following result:
HTTP_HOST:	subdomain-test.subdomain.domain.com
QUERY_STRING:	subdomain/test
REQUEST_URI:	subdomain/test
SCRIPT_FILENAME:	/home/krasmebel/subdomain.domain.com/docs/index.php
drupal_get_normal_path:	~subdomain-test/subdomain/test

Drupal's inbound URL rewriting - show/hide details	Working
HTTP request to http://subdomain-test.subdomain.domain.com/subdomain/test resulted in an internal Drupal path of ~subdomain-test/subdomain/test

Drupal's outbound URL rewriting - show/hide details	Working
Drupal API: url('~subdomain-test/subdomain/test') returned 'http://subdomain-test.subdomain.domain.com/subdomain/test'

$cookie_domain in settings.php - show/hide details	Not yet set
The $cookie_domain variable in settings.php is not set. Uncomment and set the $cookie_domain variable to your base domain (e.g. "example.com")

I set $cookie_domain="subdomain.domain.com" in settings.php, but it not work.

I add to htaccess (as #2 )

  RewriteCond %{HTTP_HOST} !^www\.([^.]+)\.([^.]+)\.([^.]+)$
  RewriteCond %{HTTP_HOST} ^([^.]+)\.([^.]+)\.([^.]+)\.([^.]+)$

, but it not work.
Can you help me?

Did you uncomment the $cookie_domain line? i.e. did you remove the "#" from in front of "$cookie_domain"?

Did you uncomment the $cookie_domain line? i.e. did you remove the "#" from in front of "$cookie_domain"?
Yes :)

Dimm,

whoops, I should have noticed this before, but if you are using the latest version of 6.x, you don't need to change your .htaccess file in any way.

i.e. If you put the following section in your .htaccess file

 # REQUIRED BY SUBDOMAIN.MODULE
  # Moves subdomain to URI path
  # e.g: mysubdomain.example.com
  # becomes example.com/index.php?_mysubdomain/
  # NOTE: does not rewrite subdomain if it is "www".
  # If you want it to rewrite www, disable the 2nd line
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{HTTP_HOST} !^www\.([^.]+)\.([^.]+)$
  RewriteCond %{HTTP_HOST} ^([^.]+)\.([^.]+)\.([^.]+)$
  RewriteRule ^(.*)$ index.php?q=~%1/$1 [L,QSA]

go ahead and remove it

I found error!
First I comment string
# $cookie_domain = 'example.com';
And write my string
$cookie_domain = 'mydomain.com';
It give error.
$cookie_domain in settings.php - show/hide details Not yet set

Now I delete string
# $cookie_domain = 'example.com';
Work Ok:
$cookie_domain in settings.php - show/hide details Set

Problem in function subdomain_check_cookie_domain()
It found comment line # $cookie_domain = 'example.com'; and give error.

glad you were able to fix it :-).