Hi Saqib Masood
I have the exact same requirement to access the Business objects (Mobile, webi, explorer,dashobards) from external network for a government client, i configured the server.xml on the Tomcat for (https:servername:8443/BOE/BI) to work. Its working fine. could you please let me know what further steps you have performed in detail to achieve the same.
I also configured the SSL certificates and facing the same issue which you posted on your cmd screenshots, In the comments section below, confirmed that its an overkill to have SSL configured within the network and you disabled it. I opened a ticket with SAP as well. I am curious to know how to get resolved if you know the solution. Appreciate your help. Thanks in advance.