App TranSport security, allow arbitrary load not working after upgrade to IOS 10.1

Question

I have an app that works fine in ios 9 and 10.0 (I have add the App Transport Security blocking with “Allow Arbitrary Loads = YES” to my info.plist. But after upgrade to 10.1 and Xcode 8.1 there seem to be a problem with the App Transport Security. I can not connect to server. My server only support up to TLS 1.1

Showing this error

Error Domain=NSURLErrorDomain Code=-1022 "The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.

May be IOS 10.1 ignore the .plist info. (Note that on 9.3 till 10.0 it is still working fine).

My .plist file

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>CFBundleDevelopmentRegion</key>
    <string>en</string>
    <key>CFBundleDisplayName</key>
    <string>SingPost</string>
    <key>CFBundleExecutable</key>
    <string>${EXECUTABLE_NAME}</string>
    <key>CFBundleIdentifier</key>
    <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
    <key>CFBundleInfoDictionaryVersion</key>
    <string>6.0</string>
    <key>CFBundleName</key>
    <string>${PRODUCT_NAME}</string>
    <key>CFBundlePackageType</key>
    <string>APPL</string>
    <key>CFBundleShortVersionString</key>
    <string>1.8.7</string>
    <key>CFBundleSignature</key>
    <string>????</string>
    <key>CFBundleURLTypes</key>
    <array>
        <dict>
            <key>CFBundleURLSchemes</key>
            <array>
                <string>fb1540614276180366</string>
            </array>
            <key>Item 0</key>
            <string>fb1540614276180366</string>
        </dict>
    </array>
    <key>CFBundleVersion</key>
    <string>1.8.7</string>
    <key>FacebookAppID</key>
    <string>1540614276180366</string>
    <key>FacebookDisplayName</key>
    <string>Singpost</string>
    <key>LSRequiresIPhoneOS</key>
    <true/>
    <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
        <key>NSAllowsArbitraryLoadsInWebContent</key>
        <true/>
        <key>NSExceptionDomains</key>
        <dict>
            <key>prdesb1.singpost.com</key>
            <dict>
                <key>NSIncludesSubdomains</key>
                <true/>
                <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
                <true/>
                <key>NSTemporaryExceptionMinimumTLSVersion</key>
                <string>TLSv1.1</string>
                <key>NSTemporaryExceptionRequiresForwardSecrecy</key>
                <false/>
            </dict>
            <key>mobile.singpost.com</key>
            <dict>
                <key>NSIncludesSubdomains</key>
                <true/>
                <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
                <true/>
                <key>NSTemporaryExceptionMinimumTLSVersion</key>
                <string>TLSv1.1</string>
                <key>NSTemporaryExceptionRequiresForwardSecrecy</key>
                <false/>
            </dict>
        </dict>
    </dict>
    <key>NSCameraUsageDescription</key>
    <string>$(PRODUCT_NAME) camera use</string>
    <key>NSLocationAlwaysUsageDescription</key>
    <string>    </string>
    <key>NSLocationWhenInUseUsageDescription</key>
    <string>    </string>
    <key>NSPhotoLibraryUsageDescription</key>
    <string>$(PRODUCT_NAME) uses photos</string>
    <key>UIAppFonts</key>
    <array>
        <string>OpenSans-Regular.ttf</string>
        <string>OpenSans-Bold.ttf</string>
        <string>OpenSans-Semibold.ttf</string>
        <string>OpenSans-Light.ttf</string>
        <string>OpenSans-LightItalic.ttf</string>
    </array>
    <key>UIBackgroundModes</key>
    <array>
        <string>remote-notification</string>
    </array>
    <key>UIRequiredDeviceCapabilities</key>
    <array>
        <string>armv7</string>
    </array>
    <key>UIRequiresFullScreen</key>
    <true/>
    <key>UISupportedInterfaceOrientations</key>
    <array>
        <string>UIInterfaceOrientationPortrait</string>
    </array>
    <key>UISupportedInterfaceOrientations~ipad</key>
    <array>
        <string>UIInterfaceOrientationPortrait</string>
    </array>
</dict>
</plist>

I fix my add exeptiondomain but have this error in console

NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9802) –

Edit from suggestion. I change my plist to

<key>mobile.singpost.com</key>
            <dict>
                <key>NSIncludesSubdomains</key>
                <true/>
                <key>NSExceptionAllowsInsecureHTTPLoads</key>
                <true/>
                <key>NSExceptionMinimumTLSVersion</key>
                <string>TLSv1.1</string>
                <key>NSExceptionRequiresForwardSecrecy</key>
                <false/>
            </dict>
            <key>mysam.sg</key>
            <dict>
                <key>NSIncludesSubdomains</key>
                <true/>
                <key>NSExceptionAllowsInsecureHTTPLoads</key>
                <true/>
                <key>NSExceptionMinimumTLSVersion</key>
                <string>TLSv1.1</string>
                <key>NSExceptionRequiresForwardSecrecy</key>
                <false/>
            </dict>

Answer 1

By specifying NSAllowsArbitraryLoadsInWebContent, you are overriding NSAllowsArbitraryLoads on iOS 10.

In iOS 10 and later, and macOS 10.12 and later, the value of [the NSAllowsArbitraryLoads] key is ignored if any of the following keys are present in your app’s Info.plist file:

• NSAllowsArbitraryLoadsForMedia
• NSAllowsArbitraryLoadsInWebContent
• NSAllowsLocalNetworking

Source: App Transport Security dictionary primary keys (Apple)

Additionally, the NSExceptionDomain dictionaries you have provided don't seem to match the current documented format. Specifically, the keys don't match:

• NSTemporaryExceptionAllowsInsecureHTTPLoads should be NSExceptionAllowsInsecureHTTPLoads

• NSTemporaryExceptionMinimumTLSVersion should be NSExceptionMinimumTLSVersion

• NSTemporaryExceptionRequiresForwardSecrecy should be NSExceptionRequiresForwardSecrecy