The request was aborted: Could not create SSL/TLS secure channel


hi everyone,

we have program written java provide web api https, , have client written c# call web api following code:

servicepointmanager.servercertificatevalidationcallback = delegate { return true; };  using (var webclient = new webclient())  {       //webclient.usedefaultcredentials = true;       webclient.encoding = encoding.utf8;       webclient.uploadstring("https://corpserver:58583/api/login", "post", json);  }

it works fine, microsoft releases may 2015 .net security updates, our client can't call web api anymore, error message is: the request aborted: not create ssl/tls secure channel, status code is: securechannelfailure(internalstatus = requestfatal). 

any ideas?

best regards

hi,

there 3 options fix issue:

  • ask user uninstall kb3061518
  • add clientminkeybitlength 0x00000200(512) value under hkey_local_machine\system\currentcontrolset\control\securityproviders\schannel\keyexchangealgorithms\diffie-hellman. allow windows not block dhe 512 bits.
  • update java 8 use dhe 1024 bits default. see jdk 8 use tls 1.2 default



Visual Studio Languages  ,  .NET Framework  >  Visual C#



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