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Could not generate DH keypair #7738

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Could not generate DH keypair#7738
Bug
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ylangisc
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ftp-tlsFTP (TLS) Protocol Implementation
Milestone
4.4.4

Description

@cyberduck
cyberduck
opened on Jan 16, 2014

7cff5db created the issue

I want to connect to an FTPS server but I get an error message:

Connection failed

java.lang.RuntimeException: Could not generate DH keypair.

220 ProFTPD 1.3.4a Server (Debian)
AUTH TLS
234 AUTH TLS successful

I have JRE 1.7.0_51. I installed the "Unlimited Strength Java(TM) Cryptography Extension Policy Files" but no success.

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  1. cyberduck commented on Jan 16, 2014

    @cyberduck
    cyberduck
    on Jan 16, 2014
    ContributorAuthor

    @dkocher commented

    Replying to [7738 raimund]:

    I have JRE 1.7.0_51. I installed the "Unlimited Strength Java(TM) Cryptography Extension Policy Files" but no success.

    There is no JRE installation requirement to run Cyberduck and it is not used.

  2. cyberduck commented on Jan 16, 2014

    @cyberduck
    cyberduck
    on Jan 16, 2014
    ContributorAuthor

    @dkocher commented

    What is the server DNS name you are trying to connect to?

  3. cyberduck commented on Jan 16, 2014

    @cyberduck
    cyberduck
    on Jan 16, 2014
    ContributorAuthor

    7cff5db commented

    Unfortunately it's a private FTP server, but I've attached a tcpdump capture of the traffic.

  4. cyberduck commented on Jan 16, 2014

    @cyberduck
    cyberduck
    on Jan 16, 2014
    ContributorAuthor

    @dkocher commented

    Possibly related to JDK-6956398.

  5. cyberduck commented on Jan 24, 2014

    @cyberduck
    cyberduck
    on Jan 24, 2014
    ContributorAuthor

    @dkocher commented

    Can you please test with the latest snapshot build available and let us know if it works.

  6. cyberduck commented on Jan 24, 2014

    @cyberduck
    cyberduck
    on Jan 24, 2014
    ContributorAuthor

    7cff5db commented

    Unfortunately no luck with Version 4.4.4 (14217) - still the same error message.

  7. cyberduck commented on Jan 28, 2014

    @cyberduck
    cyberduck
    on Jan 28, 2014
    ContributorAuthor

    @dkocher commented

    In 5a48ed5.

  8. cyberduck
    closed this as completedon Jan 28, 2014

  9. cyberduck commented on Jan 29, 2014

    @cyberduck
    cyberduck
    on Jan 29, 2014
    ContributorAuthor

    @dkocher commented

    Please update to the latest snapshot build available.

  10. cyberduck commented on Jan 29, 2014

    @cyberduck
    cyberduck
    on Jan 29, 2014
    ContributorAuthor

    7cff5db commented

    Yippie, it works, thank you!

  11. cyberduck
    assigned
    ylangisc
    on Nov 26, 2021
  12. iterate-ch
    locked as resolved and limited conversation to collaborators on Nov 26, 2021
  13. dkocher
    removed
    bug
    on Sep 1, 2025
  14. dkocher
    added the
    Bug
    issue type on Sep 1, 2025
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