Hello! It seems opscenter is not configured correctly or the HTTPS settings are not secure enough. Here is the message I get when I try to login with Opera:
A quick search on the web points me to a weak key (smaller than 1024bit) being used for the https connections. Where/how can I fix this? The other browsers allow me to connect but I would prefer not using IE or Firefox...
You didn't mention which version of OpsCenter you're running but this might apply:
OpsCenter SSL certificate signed by using a weak hash algorithm
This might also help:
How to replace the default OpsCenter 7.6.x certificate with one using a different encryption algorithm