Proxy pass from HTTP to HTTPS is failing with bad gateway error "502"

Question

I am trying pass HTTP from Oracle HTTP (OHS) to External, works via non-ssl, However, SSL is a bit challenging "OHS---NON-SSL--->External System(ssl)", and via SSL I am seeing " " error need some light on this.

Errors seen in ohs logs:

[] [OHS] [ERROR:32] [] [core.c] [host_id: xxxxxxxxx.xxxx.xxxx] [host_addr: aa.aa.a.aaa] [tid: ] [user: oracle] [ecid:] [rid: 0] [VirtualHost: zzzzzzzzz:bbbb]  NZ Library Error: SSL fatal alert

[] [OHS] [ERROR:32] [] [core.c] [host_id: xxxxxxxxx.xxxx.xxxx] [host_addr: aa.aa.a.aaa] [tid: ] [user: oracle] [ecid: ] [rid: 0] [VirtualHost: zzzzzzzzz:bbbb] (20014)Internal error:  : pass  body failed to xx.xx.x.xxx:cccc (dddddddddddd.ddd.dddd)

[] [OHS] [ERROR:32] [] [core.c] [host_id: xxxxxxxxx.xxxx.xxxx] [host_addr: aa.aa.a.aaa] [tid: ] [user: oracle] [ecid: ] [rid: 0] [VirtualHost: zzzzzzzzz:bbbb]  : pass  body failed to xx.xx.x.xxx:cccc (dddddddddddd.ddd.dddd) from yy.yy.yy.yyy ()

Pass used in

 <IfModule mod_proxy.c> 
  SSLProxyEngine On 
  SSLPROXYWALLET "/zzz/zzzzzz/zzzzzzzzWallet" 
  ProxyPass / https://###.###.#####.######:XXXX/sss/aaa.sddd.sss.dddd/XXXX
  ProxyPassReverse / https://###.###.#####.######:XXXX/sss/aaa.sddd.sss.dddd/XXXX
  ProxyPreserveHost On 
  ProxyRequests off 
  </IfModule>

Answer 1

I think port 443 has been blocked in firewall level..just check whether port is opened or not by using netstat command.