Hi Shashank,
As you wrote, you need to access http://<WebServerHost>:80<SAPHANAinstance>/sap/hana/xs/admin/ instead of http://<WebServerHost>:3<SAPHANAinstance>15/sap/hana/xs/admin/
If you can see "XS Engine is up and running" when you visit http://<WebServerHost>:80<SAPHANAinstance>, the web server is running.
Best regards,
Wenjun