diff --git a/src/libraries/Common/src/System/Net/SocketProtocolSupportPal.Unix.cs b/src/libraries/Common/src/System/Net/SocketProtocolSupportPal.Unix.cs
index 8de1e2a0f4ce31..c755c16517c77a 100644
--- a/src/libraries/Common/src/System/Net/SocketProtocolSupportPal.Unix.cs
+++ b/src/libraries/Common/src/System/Net/SocketProtocolSupportPal.Unix.cs
@@ -15,7 +15,9 @@ private static unsafe bool IsSupported(AddressFamily af)
             IntPtr socket = invalid;
             try
             {
-                return Interop.Sys.Socket(af, SocketType.Dgram, 0, &socket) != Interop.Error.EAFNOSUPPORT;
+                Interop.Error result = Interop.Sys.Socket(af, SocketType.Dgram, 0, &socket);
+                // we get EAFNOSUPPORT when family is not supported by Kernel, EPROTONOSUPPORT may come from policy enforcement like FreeBSD jail()
+                return result != Interop.Error.EAFNOSUPPORT && result != Interop.Error.EPROTONOSUPPORT;
             }
             finally
             {