If you're having this problem with Amazon S3 as me, try to paste this on your info.plist as a direct child of your top level tag
<key>NSAppTransportSecurity</key>
<dict>
<key>NSExceptionDomains</key>
<dict>
<key>amazonaws.com</key>
<dict>
<key>NSThirdPartyExceptionMinimumTLSVersion</key>
<string>TLSv1.0</string>
<key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
<false/>
<key>NSIncludesSubdomains</key>
<true/>
</dict>
<key>amazonaws.com.cn</key>
<dict>
<key>NSThirdPartyExceptionMinimumTLSVersion</key>
<string>TLSv1.0</string>
<key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
<false/>
<key>NSIncludesSubdomains</key>
<true/>
</dict>
</dict>
</dict>
You can find more info at:
http://docs.aws.amazon.com/mobile/sdkforios/developerguide/ats.html#resolving-the-issue