Weak Diffie-Hellman certificate error

Weak Diffie-Hellman certificate error

I have succesfuly installed a GoDaddy SSL certificate. Our helpdesk works on chrome no problem. But on Firefox we ran into the following problem https://www.lmeservices.com/weak-ephemeral-diffie-hellman-public-key/
we then did the work around and that fixed it. On IE though we cant get it to work. But also should I have to be doing this for this to work? Please help.

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