Unable to Login in RT4.2


I am new to RT.
I have just installed RT on Ubuntu 16 and installation was successful but whenever I try to login through webui it gives an error “Your Username and Password is incorrect”.
I have tried my DB password and default RT login password as well “root” and “password”

Here ismy Nginx conf file:
server {
listen 80;
server_name servicedesk.skandha.tv;
access_log /var/log/nginx/access.log;
root /usr/share/request-tracker4/html;

    location / {

        root  /usr/share/request-tracker4/html;
        fastcgi_param  QUERY_STRING       $query_string;
        fastcgi_param  REQUEST_METHOD     $request_method;
        fastcgi_param  CONTENT_TYPE       $content_type;
        fastcgi_param  CONTENT_LENGTH     $content_length;

        fastcgi_param  SCRIPT_NAME        "/rt";
        fastcgi_param  PATH_INFO          $uri;
        fastcgi_param  REQUEST_URI        $request_uri;
        fastcgi_param  DOCUMENT_URI       $document_uri;
        fastcgi_param  DOCUMENT_ROOT      $document_root;
        fastcgi_param  SERVER_PROTOCOL    $server_protocol;

        fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
        fastcgi_param  SERVER_SOFTWARE    nginx/$nginx_version;

        fastcgi_param  REMOTE_ADDR        $remote_addr;
        fastcgi_param  REMOTE_PORT        $remote_port;
        fastcgi_param  SERVER_ADDR        $server_addr;
        fastcgi_param  SERVER_PORT        $server_port;
        fastcgi_param  SERVER_NAME        $server_name;

  location /NoAuth/images {
        root /opt/rt4/share/html;


RT configuration:
Set($rtname, ‘skn’);
Set($Organization, ‘skandha.in’);

Set($CorrespondAddress , ‘rt@ip-172-31-25-190.ap-south-1.compute.internal’);
Set($CommentAddress , ‘rt-comment@ip-172-31-25-190.ap-south-1.compute.internal’);


Set($WebPath , "/usr/share/request-tracker4/html ");
Set($WebBaseURL , “”);

Set($WebPort , 2930);
When I check my access log it shows below information:
] “GET /rt/NoAuth/Login.html?next=1509f9400ff240e82271eacb14b162de HTTP/1.1” 302 5

Can you please check and let me know what could be the issue?