It took a long time today to find out the real problem.
There are two situations most likely to cause the whole exception:
1. No permission is given;
a. Permission application is not added in androidmanifest.xml;
<uses-permission android:name="android.permission.INTERNET"/>
b. The format of permission application is incorrect
<!-- Mistake -->
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
c. The permission is manually shielded by the user;
2. Port less than 1024; Set a larger one, not more than the largest one;
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