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connecting to a server with a weak key.

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I have an old https iternal server. in nightly I get the error The server certificate included a public key that was too weak. (Error code: ssl_error_weak_server_cert_key)

in the release version I get a message stating "This Connection is Untrusted" anf I can continue if I click "I understand the risks"

I understand the minimum requirements for secure connection have benn changed. how can i connect to the site anyway?

I have an old https iternal server. in nightly I get the error The server certificate included a public key that was too weak. (Error code: ssl_error_weak_server_cert_key) in the release version I get a message stating "This Connection is Untrusted" anf I can continue if I click "I understand the risks" I understand the minimum requirements for secure connection have benn changed. how can i connect to the site anyway?

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Any luck in adding the host to security.tls.insecure_fallback_hosts ?

You can open the about:config page via the location/address bar and use its search bar to locate this pref:

  • security.tls.insecure_fallback_hosts

You can double-click the line to modify the pref and add the full domain to the value of this pref. If there are already websites (domains) in this list then add a comma and the new domain (no spaces). There should only be domains separated by a comma in the Value column (example.com,www.example.com).


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hi, thanks for the reply.

still no luck. do I have to restart firefox before trying again? I am using the nightly channel ( x64) could it be that the algorithm in question have been removed from the build?

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You can check what cipher suite and TLS version is used in older Firefox versions and check if the used cipher suite prefs are still present in about:config. The list of available cipher suites gets shorter and shorter with each release as vulnerable suite are removed.

See also:

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form what I see with this addon the server in question have a certificate with signature MD5/RSA with key of 512 bits only. another server with SHA/RSA and 1024 bits key is OK. I could not find in about config a way to set the minimum key length or to enable MD5.