...
Pre-Dublin SO Monitoring Deployments may experience CORS issues.
To check for this error open up the console of the browser you are using. In Mozilla Firefox do this by pressing CTRL + SHIFT + C and then selecting the console. In Google Chrome this is done by CTRL + SHIFT + I and then selecting the console. If an exception relating to CORS is displayed, then this issue must be addressed.
...
If using Firefox then the CORS everywhere extension should be used CORS Everywhere extension should be used. While if using Chrome the Allow-Control-Allow-Originshould be used.
To disable the CORS in chrome follow this thread (https://stackoverflow.com/questions/3102819/disable-same-origin-policy-in-chrome).
Internal Service Error occured for operation : GET please check backend service log. status code: 500
...