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SSL连不上服务器



在调试ssl时,

lRetVal = sl_SetSockOpt(iSockID, SL_SOL_SOCKET, \
SL_SO_SECURE_FILES_CA_FILE_NAME, \
SL_SSL_CA_CERT_FILE_NAME, \
strlen(SL_SSL_CA_CERT_FILE_NAME));

设置时,证书用.pem的文件,连接服务器时,老是返回-456的错误。

改成.der的证书后,就总是显示-155的错误,都换了好几个证书,总是这样。

求大神给解决一下