"Whitelabel Error Page"

[Mohamed Roshdy]

While openning the admin page this message appears and cann't connect to the server through android app.

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sun Dec 16 14:17:22 UTC 2018
There was an unexpected error (type=Internal Server Error, status=500).
Lookup of RMI stub failed; nested exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is: java.net.ConnectException: Connection refused (Connection refused)

 

[Max]

Hello.
Please do the steps described in corresponding item of Installation troubleshooting page.

 

[Mohamed Roshdy]

The services worked well after following these steps:
1. Check if host name is set in /etc/hosts
2. Check if host name is resolved correctly with command
ping $HOSTNAME
3. Restart WCS
but it happened again and I had to restart the services manually.
What should I do to solve this issue ?

 

[Max]

Hello.

but it happened again and I had to restart the services manually.

Is it happened after server reboot? If yes, seems like /etc/hosts modification was lost after reboot, you have to add host name and save the file again as root user.
If no, please clarify what exactly happened.
And, does WCS works after manual restart?

 

[Max]

If the error occurs after successful server work, it means that WCS core process fails. It may fail mostly when RAM is not enough. Please check if you server has at least 2 Gb RAM (see requirements on this page).