Firefox will not browse PowerConnect 3254

Hello,

Whenever I try and browse to my PowerConnect 3254 via HTTPs my FireFox returns the following error:

Secure Connection Failed

An error occurred during a connection to 192.x.y.z. The server certificate included a public key that was too weak. (Error code: ssl_error_weak_server_cert_key)

Microsoft Edge simply returns "Hmm, we can't reach this page" and yields no further information.

I have tried following the commands in these two posts to generate the RSA keys: www.dell.com/.../HOW10441

and: http://www.stevejenkins.com/blog/2011/05/dell-powerconnect-5324-setup-tasks/

I have essentially ran:

• crypto certificate 1 generate key-generate 2048 duration 1825
• crypto key generate rsa
• crypto key generate dsa
• ip https certificate 1
• (and a few others which I don't recall)
  

What am I doing wrong? any advice would be appreciated. Thank you!