iOS9 getting error “an SSL error has occurred and a secure connection to the server cannot be made”

问题

Since I upgraded my existing project with iOS 9, I keep getting the error :

An SSL error has occurred and a secure connection to the server cannot be made.

回答1:

For the iOS9, Apple made a radical decision with iOS 9, disabling all unsecured HTTP traffic from iOS apps, as a part of App Transport Security (ATS).

To simply disable ATS, you can follow this steps by open Info.plist, and add the following lines:

<key>NSAppTransportSecurity</key>
  <dict>
      <key>NSAllowsArbitraryLoads</key>
      <true/>
  </dict>

回答2:

Even though allowing arbitrary loads (NSAllowsArbitraryLoads = true) is a good workaround, you shouldn't entirely disable ATS but rather enable the HTTP connection you want to allow:

<key>NSAppTransportSecurity</key>
<dict>
  <key>NSExceptionDomains</key>
  <dict>
    <key>yourserver.com</key>
    <dict>
      <!--Include to allow subdomains-->
      <key>NSIncludesSubdomains</key>
      <true/>
      <!--Include to allow HTTP requests-->
      <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
      <true/>
      <!--Include to specify minimum TLS version-->
      <key>NSTemporaryExceptionMinimumTLSVersion</key>
      <string>TLSv1.1</string>
    </dict>
  </dict>
</dict>

回答3:

iOS 9 forces connections that are using HTTPS to be TLS 1.2 to avoid recent vulnerabilities. In iOS 8 even unencrypted HTTP connections were supported, so that older versions of TLS didn't make any problems either. As a workaround, you can add this code snippet to your Info.plist:

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>

*referenced to App Transport Security (ATS)

回答4:

If you are just targeting specific domains you can try and add this in your application's Info.plist:

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSExceptionDomains</key>
    <dict>
        <key>example.com</key>
        <dict>
            <key>NSExceptionRequiresForwardSecrecy</key>
            <false/>
            <key>NSIncludesSubdomains</key>
            <true/>
        </dict>
    </dict>
</dict>

回答5:

It appears that iOS 9.0.2 breaks requests to valid HTTPS endpoints. My current suspicion is that it is requiring SHA-256 certs or it fails with this error.

To reproduce, inspect your UIWebView with safari, and try navigating to an arbitrary HTTPS endpoint:

location.href = "https://d37gvrvc0wt4s1.cloudfront.net/js/v1.4/rollbar.min.js"
// [Error] Failed to load resource: An SSL error has occurred and a secure connection to the server cannot be made. (rollbar.min.js, line 0)

Now try going to google (because of course they have a SHA-256 cert):

location.href = "https://google.com"
// no problemo

Adding an exception to transport security (as outlined by @stéphane-bruckert's answer above) works to fix this. I also assume that completely disabling NSAppTransportSecurity would work too, though I've read that completely disabling it can jeopardize your app review.

[EDIT] I've found that simply enumerating the domains I'm connecting to in the NSExceptionDomains dict fixes this problem, even when leaving NSExceptionAllowsInsecureHTTPLoads set to true. :\

回答6:

The problem is the ssl certificate on server side. Either something is interfering or the certificate doesn't match the service. For instance when a site has a ssl cert for www.mydomain.com while the service you use runs on myservice.mydomain.com. That is a different machine.

回答7:

I get the same error when I specify my HTTPS URL as : https://www.mywebsite.com . However it works fine when I specify it without the three W's as : https://mywebsite.com .

回答8:

Xcode project -> goto info.plist and Click + Button then Add (App Transport Security Settings)Expand, Allow Arbitrary Loads Set YES. Thanks

回答9:

My issue was NSURLConnection and that was deprecated in iOS9 so i changed all the API to NSURLSession and that fixed my problem.

NSURLConnection deprecated in iOS9

回答10:

In my case I faced this issue in my simulator because my computer's date was behind of current date. So do check this case too when you face SSL error.

来源：https://stackoverflow.com/questions/32755674/ios9-getting-error-an-ssl-error-has-occurred-and-a-secure-connection-to-the-ser