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Message on SSL secured site still says this connection is untrusted.

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Why? I have purchased the certificate from a valid vendor (COMODO) and applied with no issue. IE and Google Chrome both display the website with no issue. Why will Firefox display an error? Am I being forced to use a specific SSL cert vendor?

Why? I have purchased the certificate from a valid vendor (COMODO) and applied with no issue. IE and Google Chrome both display the website with no issue. Why will Firefox display an error? Am I being forced to use a specific SSL cert vendor?

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Your server doesn't send the intermediate certificate(s).

See http://www.networking4all.com/en/support/tools/site+check/