java mail Connection Reset Errors

[Ashwanth Padmanabhan]

any idea why we are getting this connection reset error? we are trying to use pop3(in a test program as given below) to read messages from the inbox
program:

 public static void check(String host, String storeType, String user,
      String password) 
   {
	  try {
		
      //create properties field
      Properties properties = new Properties();

      properties.put("mail.pop3.host", host);
      properties.put("mail.pop3.port", "995");
      //properties.put("mail.pop3.starttls.enable", "true");
      properties.put("mail.pop3.ssl.enable", "true");
properties.put("mail.pop3.connectiontimeout", "500000");
properties.put("mail.pop3.timeout", "500000");
//properties.put("mail.pop3.starttls.required", "true" );
properties.put("mail.debug", "true");
      Session emailSession = Session.getDefaultInstance(properties);
  
      //create the POP3 store object and connect with the pop server
      Store store = emailSession.getStore("pop3");

      store.connect(host, user, password);

      //create the folder object and open it
      Folder emailFolder = store.getFolder("INBOX");
      emailFolder.open(Folder.READ_ONLY);

      // retrieve the messages from the folder in an array and print it
      Message[] messages = emailFolder.getMessages();
	    
	       
      for (int i = 0, n = messages.length; i < n; i++) {
         Message message = messages[i];
         
		 Date date = new Date();
		 date=message.getSentDate();
		 //System.out.println(date);
		 long datemilli=date.getTime();
		 //System.out.println(datemilli);
		 Date date1 = new Date();
		 
		 long date1milli=date1.getTime();
		 //System.out.println(date1milli);
		 long date2milli=date1milli-datemilli;
		 //System.out.println(date2milli);
		 
		 if (date2milli>1800000) {
			 
			 result=result+"error "+user+" since:"+message.getSentDate()+"//";
			 email_flag=1;
			 System.out.println("inside if statement now"+result+host+user);
			 break;
			 }
		
			 
      }
	  
      //close the store and folder objects
      emailFolder.close(false);
      store.close();

      } catch (NoSuchProviderException e) {
         e.printStackTrace();
      } catch (MessagingException e) {
        e.printStackTrace();
	//System.out.println("message exception e"+" "+user+" "+e);
	exceptionmsg = e.toString();
	//System.out.println("message exception e"+" "+user+" "+exceptionmsg);
	  args2[0]=user+" "+exceptionmsg;
	System.out.println("message exception e"+" "+user+" "+args2[0]);
	  SendEmailCallVersion1.main(args2);
      } catch (Exception e) {
         e.printStackTrace();
      }
   }

DEBUG POP3: mail.pop3s.starttls.enable: false DEBUG POP3: mail.pop3s.starttls.required: false DEBUG POP3: mail.pop3s.apop.enable: false DEBUG POP3: mail.pop3s.disablecapa: false DEBUG POP3: connecting to host "outlook.office365.com", port 995, isSSL true
javax.mail.MessagingException: Connect failed;
 nested exception is:
       java.net.SocketException: Connection reset
       at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:213)
       at javax.mail.Service.connect(Service.java:366)
       at javax.mail.Service.connect(Service.java:246)
       at Monitoring_Remedy_Mailboxes.check(Monitoring_Remedy_Mailboxes.java:41
)
       at Monitoring_Remedy_Mailboxes.main(Monitoring_Remedy_Mailboxes.java:152
)
Caused by: java.net.SocketException: Connection reset
       at java.net.SocketInputStream.read(SocketInputStream.java:189)
       at java.net.SocketInputStream.read(SocketInputStream.java:121)
       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:954)
       at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.
java:1343)
       at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1371
)
       at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1355
)
       at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java
:598)
       at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:372)
       at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238)
       at com.sun.mail.pop3.Protocol.<init>(Protocol.java:112)
       at com.sun.mail.pop3.POP3Store.getPort(POP3Store.java:265)
       at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:207)

[Rob Spoor]

Welcome to the Ranch!

I'm not sure that the error lies in your code, but is instead a network issue. Can you telnet to the port, or connect otherwise?


By the way, I've added code tags this time. Can you please add them yourself next time? It makes your code more readable.

[Ashwanth Padmanabhan]

yes, i am able to telnet with no issues and able to connect to the smtp server.
this issue is intermittent...but i dont see any packets that is dropping at the network level too.

[Rob Spoor]

I still suggest having a closer look at the infrastructure. If the problem is intermittent, it also means that sometimes it works, which is an indication the problem lies outside of your code.

[Ashwanth Padmanabhan]

i get this error when i turn on the debug log during ssl handshake....any idea?

main, WRITE: TLSv1 Handshake, length = 179
[Raw write]: length = 184
0000: 16 03 01 00 B3 01 00 00   AF 03 01 59 8D CF 38 AB  ...........Y..8.
0010: C1 FA 74 0E FF F3 DB B6   42 C1 17 93 55 7B 11 EF  ..t.....B...U...
0020: DF A2 9D EA 07 9B 40 3C   78 55 56 00 00 2A C0 09  ......@<xUV..*..
0030: C0 13 00 2F C0 04 C0 0E   00 33 00 32 C0 07 C0 11  .../.....3.2....
0040: 00 05 C0 02 C0 0C C0 08   C0 12 00 0A C0 03 C0 0D  ................
0050: 00 16 00 13 00 04 00 FF   01 00 00 5C 00 0A 00 34  ...........\...4
0060: 00 32 00 17 00 01 00 03   00 13 00 15 00 06 00 07  .2..............
0070: 00 09 00 0A 00 18 00 0B   00 0C 00 19 00 0D 00 0E  ................
0080: 00 0F 00 10 00 11 00 02   00 12 00 04 00 05 00 14  ................
0090: 00 08 00 16 00 0B 00 02   01 00 00 00 00 1A 00 18  ................
00A0: 00 00 15 6F 75 74 6C 6F   6F 6B 2E 6F 66 66 69 63  ...outlook.offic
00B0: 65 33 36 35 2E 63 6F 6D                            e365.com
main, handling exception: java.net.SocketException: Connection reset
main, SEND TLSv1.2 ALERT:  fatal, description = unexpected_message
main, WRITE: TLSv1.2 Alert, length = 2
main, Exception sending alert: java.net.SocketException: Connection reset by peer: socket write error
main, called closeSocket()

[Rob Spoor]

Ashwanth Padmanabhan wrote:Connection reset by peer

That (usually) indicates the other side has closed the connection. That's hardly ever your fault.