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POErlang node connectivity problem
 

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    <p>Struggling with connecting 2 nodes running on separate boxes. Tried to make sure that there is no usual problems with cookie synchronization, DNS or firewall.</p> <p>First, I run epmd in debug mode as recommended by Erlang docs:</p> <p><strong>epmd -d -d</strong></p> <p>Then on box #1:<br> <strong>erl -name xmpp1@server1.net -kernel inet_dist_listen_min 6000 inet_dist_listen_max 6050 -setcookie testcookie</strong></p> <p>and on box #2:<br> <strong>erl -name xmpp2@server2.net -kernel inet_dist_listen_min 6000 inet_dist_listen_max 6050 -setcookie testcookie</strong></p> <p>No luck with ping. For example, on box #2: </p> <p><code>Erlang (BEAM) emulator version 5.6.4 [source] [64-bit] [smp:4] [async-threads:0] [kernel-poll:false] Eshell V5.6.4 (abort with ^G)<br> (xmpp2@server2.net)1&gt; net_adm:ping('xmpp1@server1.net').<br> pang</code></p> <p>epmd on server1.net shows following:</p> <p><code>epmd: Sun Sep 12 01:40:32 2010: opening connection on file descriptor 6<br> epmd: Sun Sep 12 01:40:32 2010: got 8 bytes<br> ***** 00000000 00 06 7a 78 6d 70 70 31 |..zxmpp1|<br> epmd: Sun Sep 12 01:40:32 2010: ** got PORT2_REQ<br> epmd: Sun Sep 12 01:40:32 2010: got 18 bytes<br> ***** 00000000 77 00 17 70 4d 00 00 05 00 05 00 05 78 6d 70 70 |w..pM.......xmpp|<br> ***** 00000010 31 00 |1.|<br> epmd: Sun Sep 12 01:40:32 2010: ** sent PORT2_RESP (ok) for "xmpp1"<br> epmd: Sun Sep 12 01:40:32 2010: closing connection on file descriptor 6</code> </p> <p>i.e., appears to receive ping request from second node and respond with ok. </p> <p>Tshark listening on epmd port (TCP 4369) gives following (I replaced real IPs with server names): </p> <p><code>1 0.000000 server2.net -&gt; server1.net TCP 43809 &gt; epmd [SYN] Seq=0 Win=5840 Len=0 MSS=1460 SACK_PERM=1 TSV=776213773 TSER=0 WS=5<br> 2 0.000433 server1.net -&gt; server2.net TCP epmd &gt; 43809 [SYN, ACK] Seq=0 Ack=1 Win=5792 Len=0 MSS=1460 SACK_PERM=1 TSV=1595930818 TSER=776213773 WS=6<br> 3 0.000483 server2.net -&gt; server1.net TCP 43809 &gt; epmd [ACK] Seq=1 Ack=1 Win=5856 Len=0 TSV=776213773 TSER=1595930818<br> 4 0.000545 server2.net -&gt; server1.net EPMD 43809 &gt; epmd [PSH, ACK] Seq=1 Ack=1 Win=5856 Len=8 TSV=776213773 TSER=1595930818<br> 5 0.001445 server1.net -&gt; server2.net TCP epmd &gt; 43809 [ACK] Seq=1 Ack=9 Win=5824 Len=0 TSV=1595930818 TSER=776213773<br> 6 0.001466 server1.net -&gt; server2.net EPMD epmd &gt; 43809 [PSH, ACK] Seq=1 Ack=9 Win=5824 Len=18 TSV=1595930818 TSER=776213773<br> 7 0.001474 server2.net -&gt; server1.net TCP 43809 &gt; epmd [ACK] Seq=9 Ack=19 Win=5856 Len=0 TSV=776213773 TSER=1595930818<br> 8 0.001481 server1.net -&gt; server2.net TCP epmd &gt; 43809 [FIN, ACK] Seq=19 Ack=9 Win=5824 Len=0 TSV=1595930818 TSER=776213773<br> 9 0.001623 server2.net -&gt; server1.net TCP 43809 &gt; epmd [FIN, ACK] Seq=9 Ack=20 Win=5856 Len=0 TSV=776213773 TSER=1595930818<br> 10 0.001990 server1.net -&gt; server2.net TCP epmd &gt; 43809 [ACK] Seq=20 Ack=10 Win=5824 Len=0 TSV=1595930818 TSER=776213773</code> </p> <p>So it looks to me that there is no firewall issues, as epmd instances talk to each other. What am I missing?</p> <p>Your advise is very much appreciated!</p> <p>Best regards, Boris</p>
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