Currently Web Listener not listening over HTTP? Did you check that?
1)I mean
http://your_apps_node_hostname:8000 , did you check reaching that url? What happens?
Normally, disabling the HTTP port is an extra step but it is highly recommended ->
See: Enabling TLS in Oracle E-Business Suite Release 12.1 (Doc ID 376700.1) - 6.2 Disable the HTTP Port
So if you didn't disable the HTTP port, it should be still accessible.. Please check that..
However, once again -> You may optionally configure Oracle E-Business Suite to disable the HTTP port and use only the HTTPS port. Although this configuration is optional, we strongly recommend that you implement this configuration..
2)So, as for your question, if you disable the HTTP port, you need to modify all the shortcuts used for EBS login url on client tier.. But please answer my first question first..