In order to validate a domain name for self signed certificates, you MUST use pinning，AFNetWorking使用自签证书时出现问题。

上述问题的解决方法：

//如果是需要验证自建证书，需要设置为YES

securityPoliy.allowInvalidCertificates =YES;

securityPoliy.validatesDomainName =NO;//不验证证书的域名

HTTPS步骤：

1.从服务器要来.crt格式的证书，然后用Mac钥匙串打开，然后导出.cer格式的证书

2.把.cer证书导入程序的 NSBundle中。

验证证书的代码：

NSString*cerPath = [[NSBundlemainBundle] pathForResource:@"test"ofType:@"cer"];

NSData*cerData = [NSDatadataWithContentsOfFile:cerPath];

NSSet*cerSet = [[NSSetalloc]initWithObjects:cerData,nil];

AFSecurityPolicy *securityPoliy = [AFSecurityPolicy defaultPolicy];

//allowInvalidCertificates 是否允许无效证书（也就是自建的证书），默认为NO

//如果是需要验证自建证书，需要设置为YES

securityPoliy.allowInvalidCertificates =YES;

securityPoliy.validatesDomainName =NO;

//设置证书

[securityPoliy setPinnedCertificates:cerSet];

[dxClient setSecurityPolicy:securityPoliy];

参考:

http://www.cnblogs.com/Crazy-ZY/p/6094383.html

//www.greatytc.com/p/4102b817ff2f

http://stackoverflow.com/questions/33066819/error-domain-nscocoaerrordomain-code-3840-json-text-did-not-start-with-array-or