Hi Salman ,

I tried the #a2enmod rewrite and restarted the apache2 still the same issue .  

I changed AllowOverride All to AllowOverride None since I was getting 43 forbidden .

Alias /siremis "/opt/siremis-4.0.0/siremis"

        <Directory "/opt/siremis-4.0.0/siremis">

                Options Indexes FollowSymLinks MultiViews

                #AllowOverride All

                AllowOverride None

                Allow from all

                <FilesMatch "\.xml$">

                        Allow from all

                </FilesMatch>

                <FilesMatch "\.inc$">

                        Allow from all

                </FilesMatch>

        </Directory>

Regards,

Prem Chandiran M