I am facing multiple problem with CWP and SSL

Hostname and IP address so we can do some external checks.

the hostname and ip are already provided in the images above.

Your image isn't appearing.  Just type them.

Hostname: server.alpahnode.in
IP: 140.238.243.255

When I do a dns lookup for server.alpahnode.in, alpanode.in i get NXDOMAIN.  Did you purchase the domain name?

Corrected your spelling for "alphanode.in"  You do not have an A record for panel.alphanode.in, so letsencrypt cannot possibly do a valid lookup to issue it a certificate

Leaf DNS is showing the A record as what you entered.
http://leafdns.com/index.cgi?testid=6A3F09FB

Is this on a NAT?
Since you seem to have everything going to that poor single IP.
http://leafdns.com/index.cgi?testid=EA888DD3

Do you have port 80 & 443 open in your firewall & upstream?

Corrected your spelling for "alphanode.in"  You do not have an A record for panel.alphanode.in, so letsencrypt cannot possibly do a valid lookup to issue it a certificate

I am using server.alphanode.in as hostname not using panel.alphanode.in

Leaf DNS is showing the A record as what you entered.
http://leafdns.com/index.cgi?testid=6A3F09FB

Is this on a NAT?
Since you seem to have everything going to that poor single IP.
http://leafdns.com/index.cgi?testid=EA888DD3

Do you have port 80 & 443 open in your firewall & upstream?

I don't think it's going through a NAT since this is a VPS. created it only for testing CWP.

I'm getting an 'DNS_PROBE_FINISHED_NXDOMAIN' now where before when I tried it I got the default CWP page, which was correct when I tried server.alphanode.in.

And alphanode.in and the IP associated to everything is giving 'ERR_CONNECTION_REFUSED'.

As when you enter the server FQDN or IP, you should get the default CWP page, unless you have changed it manually.

If you would like, send me a PM with the login info, and I can login and take a look at what's going on.
I can already see there is no SSL for the hostname.