Url rewriting causes Magento admin to become inaccessible

I have magento in a subdirectory in the root and if I set the secure base url and secure base url link to the correct shared ssl url to enable secure pages I have no problem in the FRONTEND. The pages displays as they should. However when I try to access the admin with the secure link below I cannot gain admittance.

For instance in the frontend: http:/mydomain.com/shop becomes http:/mydomain.com ---which is correct

https:/mydomain.sharedssl.com/shop/customer/account/login/ becomes https:/mydomain.sharedssl.com/customer/account/login/ ---which is correct

but then I cannot access admin with either : https:/mydomain.com/shop/index.php/stddadmin/ or https:/mydomain.com//index.php/stddadmin/

I know the link only has one forward slash but this is the only way to get the question submitted in the root directory I have this in my htaccess:

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} !^/shop(.*)
RewriteRule (.*) /shop/$1 [L]

and in the shop (Magento) I have the following:

############################################
## uncomment these lines for CGI mode
## make sure to specify the correct cgi php binary file name
## it might be /cgi-bin/php-cgi

#    Action php5-cgi /cgi-bin/php5-cgi
#    AddHandler php5-cgi .php

############################################
## GoDaddy specific options

#   Options -MultiViews

## you might also need to add this line to php.ini
##     cgi.fix_pathinfo = 1
## if it still doesn't work, rename php.ini to php5.ini

############################################
## this line is specific for 1and1 hosting

    #AddType x-mapp-php5 .php
    #AddHandler x-mapp-php5 .php

############################################
## default index file

    DirectoryIndex index.php

<IfModule mod_php5.c>

############################################
## adjust memory limit

#    php_value memory_limit 64M
    php_value memory_limit 128M
    php_value max_execution_time 18000

############################################
## disable magic quotes for php request vars

    php_flag magic_quotes_gpc off

############################################
## disable automatic session start
## before autoload was initialized

    php_flag session.auto_start off

############################################
## enable resulting html compression

    #php_flag zlib.output_compression on

###########################################
# disable user agent verification to not break multiple image upload

    php_flag suhosin.session.cryptua off

###########################################
# turn off compatibility with PHP4 when dealing with objects

    php_flag zend.ze1_compatibility_mode Off

</IfModule>

<IfModule mod_security.c>
###########################################
# disable POST processing to not break multiple image upload

    SecFilterEngine Off
    SecFilterScanPOST Off
</IfModule>

<IfModule mod_deflate.c>

############################################
## enable apache served files compression
## http://developer.yahoo.com/performance/rules.html#gzip

    # Insert filter on all content
    ###SetOutputFilter DEFLATE
    # Insert filter on selected content types only
    #AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/javascript

    # Netscape 4.x has some problems...
    #BrowserMatch ^Mozilla/4 gzip-only-text/html

    # Netscape 4.06-4.08 have some more problems
    #BrowserMatch ^Mozilla/4\.0[678] no-gzip

    # MSIE masquerades as Netscape, but it is fine
    #BrowserMatch \bMSIE !no-gzip !gzip-only-text/html

    # Don't compress images
    #SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary

    # Make sure proxies don't deliver the wrong content
    #Header append Vary User-Agent env=!dont-vary

</IfModule>

<IfModule mod_ssl.c>

############################################
## make HTTPS env vars available for CGI mode

    #SSLOptions StdEnvVars

</IfModule>

<IfModule mod_rewrite.c>

############################################
## enable rewrites

    Options +FollowSymLinks
    RewriteEngine on

############################################
## you can put here your magento root folder
## path relative to web root

    RewriteBase /


############################################
## workaround for HTTP authorization
## in CGI environment

    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

############################################
## always send 404 on missing files in these folders

    RewriteCond %{REQUEST_URI} !^/(media|skin|js)/

############################################
## never rewrite for existing files, directories and links

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-l

############################################
## rewrite everything else to index.php

    RewriteRule  ^(.*)$ /shop/index.php [L]



</IfModule>


############################################
## Prevent character encoding issues from server overrides
## If you still have problems, use the second line instead

    AddDefaultCharset Off
    #AddDefaultCharset UTF-8

<IfModule mod_expires.c>

############################################
## Add default Expires header
## http://developer.yahoo.com/performance/rules.html#expires

    ExpiresDefault "access plus 1 year"

</IfModule>

############################################
## By default allow all access

    Order allow,deny
    Allow from all

############################################
## If running in cluster environment, uncomment this
## http://developer.yahoo.com/performance/rules.html#etags

    #FileETag none

Could someone lend some assistance to getting this to work in the Magento backend?

ansaurus

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Url rewriting causes Magento admin to become inaccessible

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