Ok, after reading
I'm getting an error connecting Saros with my Google Talk /
GMail or another account?
You can use your registered Google Talk account, but in the case of an
error try this:
* Leave the server and password field blank.
(password = port ?!)
This is my last attempt to explain how connecting to an XMPP Server works.
1. An XMPP Service is hosted on a server at a specific port. The domain
name of your JID is somewhat "pointless" at this moment.
2. TLS http://xmpp.org/rfcs/rfc3920.html#tls and SASL
http://xmpp.org/rfcs/rfc3920.html#sasl have "no" impact on the IP
address and port of the XMPP server you are connected to.
So here is what is going on.
If you leave the server and port field blank we do not know where we
should connect to.
So SMACK is doing a DNS Lookup by using the domain part of the JID
(unluckily it uses SUN / ORACLE internal JAVA APIs which might not be
available on older MAC JVM distributions)
So here is what is happening ... the domain is:
saros-con.imp.fu-berlin.de but our ejabberd runs on
saros-build.imp.fu-berlin.de
Performing a lookup results in:
nslookup -querytype=srv _xmpp-client._tcp.saros-con.imp.fu-berlin.de
Server: easy.box
Address: 192.168.2.1
Non-authoritative answer:
_xmpp-client._tcp.saros-con.imp.fu-berlin.de SRV service location:
priority = 5
weight = 0
port = 5222
svr hostname = saros-con.imp.fu-berlin.de
So what is wrong here: we have not configured any SRV ... instead we
added an DNS entry with the same IP as saros-build.imp.fu-berlin.de
nslookup saros-build.imp.fu-berlin.de
Server: easy.box
Address: 192.168.2.1
Name: saros-build.imp.fu-berlin.de
Address: 160.45.111.17
nslookup saros-con.imp.fu-berlin.de
Server: easy.box
Address: 192.168.2.1
Non-authoritative answer:
Name: saros-build.imp.fu-berlin.de
Address: 160.45.111.17
Aliases: saros-con.imp.fu-berlin.de
------------------------------------------------------------------------------------
Doing the same with Google:
nslookup -querytype=srv _xmpp-client._tcp.googlemail.com
Server: easy.box
Address: 192.168.2.1
Non-authoritative answer:
_xmpp-client._tcp.googlemail.com SRV service location:
priority = 20
weight = 0
port = 5222
svr hostname = alt3.xmpp.l.google.com
_xmpp-client._tcp.googlemail.com SRV service location:
priority = 20
weight = 0
port = 5222
svr hostname = alt4.xmpp.l.google.com
_xmpp-client._tcp.googlemail.com SRV service location:
priority = 5
weight = 0
port = 5222
svr hostname = xmpp.l.google.com
_xmpp-client._tcp.googlemail.com SRV service location:
priority = 20
weight = 0
port = 5222
svr hostname = alt1.xmpp.l.google.com
_xmpp-client._tcp.googlemail.com SRV service location:
priority = 20
weight = 0
port = 5222
svr hostname = alt2.xmpp.l.google.com
Where xmpp.l.google.com = talk.google.com = talk.l.google.com
Clearly states that the XMPP service is NOT hosted on googlemail.com or
gmail.com !
To simplify things ... if you are looking at the log files and you found
a : connection refused (somewhat similar exception) then
1. the DNS lookup failed OR
2. the server + port configuration is incorrect.
All other failures occur due
1a. Bugish Smack API (there are several bugs reports for SASL auth)
2a. Using TLS but connecting to the wrong port (it happens that a XMPP
server may has two ports, one for non TLS connections, one for TLS
connections)
Regardless of those failures in 1a and 2a, you will NOT get a connection
refused exception and so indicating that you are at least connected to
the XMPP server !
Conclusion: Always leave the server and port field blank ! Unless your
IT department has not set up an SRV (or you are using a JVM distribution
that does not contain the
com.sun.jndi.dns.DnsContextFactory class and its dependicies). There is
a good reason why those fields (including SASL and TLS) are only
available under the advanced options.
It assumes that the user knows what he/she is doing when changing those
values.
BR,
Stefan
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