Connection through a proxy server does not pass to all resources.

I'm testing the work of proxy servers, connecting through them to different URLs. For example, proxy server 216.171.41.43:45554 (Socks5) for the following addresses:

• https://google.com
• https://youtube.com

at the moment of receiving the stream

 in = new BufferedReader(new InputStreamReader(conn.getInputStream())); 

falls out with an error

 java.net.SocketException: Connection reset 

and does not give any code page. With all this address:

• https://ya.ru
• https://www.yahoo.com/

work fine. By the way, if you specify https://yahoo.com/ (without www ) getting the stream will fall out with the same error.

The connection itself for all addresses passes almost at the first attempt:

 URLConnection conn = url.openConnection(new Proxy(Proxy.Type.SOCKS, new InetSocketAddress(ip, port))).connect(); 

Tell me, what could be the reason for such work of proxy servers? Why does it turn out to connect to the necessary resource, but I can't get the page code?

 try { URL url = new URL("https://www.yahoo.com/"); String ip = "216.171.41.43"; int port = 45554; URLConnection conn = url.openConnection(new Proxy(Proxy.Type.SOCKS, new InetSocketAddress(ip, port))); conn.setConnectTimeout(2000); BufferedReader in = null; while (true) { try { conn.connect(); in = new BufferedReader(new InputStreamReader(conn.getInputStream())); break; } catch (Exception e) { e.printStackTrace(); } } } 

Mistake:

 java.net.SocketException: Connection reset at java.net.SocketInputStream.read(SocketInputStream.java:209) at java.net.SocketInputStream.read(SocketInputStream.java:141) at sun.security.ssl.InputRecord.readFully(InputRecord.java:465) at sun.security.ssl.InputRecord.read(InputRecord.java:503) at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:973) at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375) at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403) at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387) at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559) at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185) at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:153)