I recently upgraded my NetApp OnCommand System Manager and upon trying to login I was presented with the error: “500 Connection Refused”.
This can occur if TLS is not enabled in DataONTAP. In this particular scenario, the only SSL protocol available was SSLv3, which most browsers now have disabled by default, or if your SSL certificate on the filer has expired.
To enable TLS in DataONTAP, login to the filer via SSH and issue the following command:
options tls.enable on
If you have a high availability setup with multiple controllers, ensure that you issue the command on both nodes.