In this article we will describe most common UI errors and ways of their solution.
DNS_PROBE_FINISHED_NXDOMAIN error means that your domain is not pointed to your server or is set up incorrectly.
To resolve the issue, please check that DNS records for the domain are specified correctly.

This error means that connection attempts failed. Possible resolution steps^
- Check that port 80 (HTTP) or 443 (HTTPS) is open and connection are allowed.
- Check that nginx is launched
/etc/init.d/nginx start
- Check if necessary sites are enabled. Sites are enabling by creating symlink in directory /etc/nginx/sites-enabled/
- If you’ve edited virtual hosts reload nginx by the command
# nginx -t && nginx -s reload

If you see such error it means NGINX not properly configured or you’re requesting wrong URL. Possible ways to solve:
- Make sure that urls in configuration files are correct. Virtual hosts files are located in /etc/nginx/sites-available/
- Check if necessary sites are enabled. Sites are enabling by creating symlink in directory /etc/nginx/sites-enabled/
- Check that static file location, specified in configs from point 2 is correct.
- Since you’ve edited virtual hosts reload nginx by the command
# nginx -t && nginx -s reload

If you see a loading icon for extended time periods - it means that you web server is working and static files are accessible, but UI can't get data from the platfrom.
To resolve the issue:
- Check that your API server is working by executing
sv status api-server
If service is stopped - please restart it. If service is not launching - please refer to the logs to see the error - Check that correct domain name is specified in the Admin panel (Account Management -> Service preferences)
- Check API URL, it may be incorrect URL in the Config.js. File is located in web server's root directory, usually it is /var/www/pro-ui. Replace with correct one and reload the page
- If all points above are fine - please check memory consumption and API log. Perhaps, service has run out of memory.
If you are seeing Database error message - please check that MySQL is running
service mysql status
If needed, start the MySQL service -
service mysql start
and check it's logs
To know what error occur please start browser console pressing F12 (chrome and similar) then click on “Network tab” and choose red message. Clicking on the “Preview” you’ll see the answer from API. Mostly it is caused by error “Dealer not found”. In the admin panel, go to Service Preferences tab in the Account Management section, and insert your domain used for monitoring and save. It will be OK.
This error tells you that connection is not protected. Possible reasons
- You try to access port 443 and do not have SSL certificate installed
- Your certificate does not cover the domain name you are accessing
- Your certificate has expired
- Your certificate is not set up correctly
To resolve the issue you will need to issue a certificate if you don't have one or yours expired.