Because of the latest updates : KB2661254
It prevent to connect to any website that use a certificate with less than 1024 bits key
To fix it, you can add a dword key in the registry :
HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\OID\EncodingType 0\CertDLLCreateCertificateChainEngine\Config\
DWORD (32 bit) : MinRsaPubKeyBitLength
value : 512(decimal)
I hope it will help people, because we just lost 2 hours to find the cause, thanks Microsoft.