Monday, November 16, 2009

[Solution] QSslSocket: cannot call unresolved function SSLv3_client_method

Problem

When you try to open a HTTPS URL with QSslSocket or QNetworkAccessManager class, you get the following errors:

QSslSocket: cannot call unresolved function SSLv3_client_method
QSslSocket: cannot call unresolved function SSL_CTX_new
QSslSocket: cannot call unresolved function ERR_get_error
QSslSocket: cannot call unresolved function ERR_error_string

Solution

You need to install OpenSSL Win32 or Win64 binaries.

  1. Open Win32 OpenSSL Installation Project page.
  2. Download the latest "light" Win32 or Win64 installation package, for example "Win32 OpenSSL v0.9.8l Light".
  3. Install it to any location. Ignore "Microsoft Visual C++ 2008 Redistributables" warning (click OK) and select copying OpenSSL DLLs to "The OpenSSL binaries (\bin) directory".
  4. Copy libeay32.dll and ssleay32.dll from the \bin folder to the same place where your QtNetwork4.dll or QtNetworkd4.dll is located.
at 09:43
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18 comments:

  1. SunnyApril 22, 2010 at 4:53 PM

    Found it useful, In linux if same error occurs you need to have libcrypto.so and libssl.so in your /usr/lib

    ReplyDelete
  2. UnknownJuly 21, 2010 at 5:36 AM

    Thx, I had problems with https and this fixed it, Good job sharing solution with others

    ReplyDelete
  3. Shahi , Searching in True LoveJanuary 13, 2011 at 7:25 AM

    Thanks, you have done great job...

    ReplyDelete
  4. UnknownMarch 14, 2011 at 11:52 PM

    HOW IN LINUX?

    ReplyDelete
  5. UnknownDecember 21, 2011 at 8:02 AM

    @Systek, install OpenSSL for linux, than you need to have libcrypto.so and libssl.so in your /usr/lib. Just copy paste them!

    ReplyDelete
  6. al_aminaApril 26, 2013 at 12:46 PM

    thanks so much :)))))

    ReplyDelete
  7. UlaJune 5, 2013 at 10:42 AM

    It was really helpful. Thanks.

    ReplyDelete
  8. AnonymousJune 28, 2013 at 2:52 AM

    Hi,
    I'm trying to open a HTTPS URL with QSslSocket or QNetworkAccessManager but I haven't had success. Do you have a HOWTO o some guidance about it?
    Thanks

    ReplyDelete
  9. The Bowen FamilyAugust 6, 2013 at 5:03 AM

    For Linux CentOS6 64bit, I resolved the error by doing the following:

    yum install openssl-devel.x86_64

    ReplyDelete
  10. AnonymousSeptember 12, 2013 at 1:10 PM

    i did all above things....
    But still now i found this errors...

    QSslSocket: cannot call unresolved function SSLv3_client_method
    QSslSocket: cannot call unresolved function SSL_CTX_new

    QSslSocket: cannot call unresolved function SSL_library_init
    QSslSocket: cannot call unresolved function ERR_get_error

    QSslSocket: cannot call unresolved function ERR_error_string

    when i trying to download a file through my own download manager devoloped by Qt...
    plz help...
    thankx in advanced...

    ReplyDelete
  11. AnonymousDecember 11, 2013 at 6:34 AM

    thank so much

    ReplyDelete
  12. UnknownMarch 1, 2014 at 11:14 PM

    Thanks

    ReplyDelete
  13. UnknownApril 10, 2014 at 12:35 PM

    Thanks a lot!

    ReplyDelete
  14. neoDecember 29, 2015 at 6:51 PM

    Thanks a lot! That solved my problem :D

    ReplyDelete
  15. UnknownFebruary 9, 2018 at 12:52 PM

    I do copy libcrypto.so and libssl.so in /usr/lib
    but it doesn't solve the problem

    ReplyDelete
  16. UnknownMay 19, 2018 at 9:12 PM

    This comment has been removed by the author.

    ReplyDelete
  17. UnknownMay 19, 2018 at 9:18 PM

    I don't have libeay32.dll and ssleay32.dll in bin folder

    ReplyDelete
    Replies
    1. UnknownMay 19, 2018 at 9:22 PM

      Also i can't find tNetwork4.dll or QtNetworkd4.dll (5 versions too), but I use QT += network and it works

      Delete

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