[Asterisk-java-users] Solution to "Connection refused" exception (was: Re: asterisk-java integration with CSTA for asterisk)

[Stefan R. <sr...@re...>]

Just for the archives and anybody who might encounter a similar problem i=
n
the future:

> The problem i was having was that the connection was refused.
[...]
> *******************************
> Here is the error message from java:
> *******************************
> Oct 19, 2005 2:19:03 AM net.sf.asterisk.util.impl.JavaLoggingLog info
> INFO: Connecting to localhost port 5038
> java.net.ConnectException: Connection refused
>     at java.net.PlainSocketImpl.socketConnect(Native Method)
>     at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
>     at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:1=
71)

[...]
> *******************************
> telnet from another console
> *******************************
> cm@laptop:~> telnet 127.0.0.1 5038
> Trying 127.0.0.1...
> Connected to 127.0.0.1.
> Escape character is '^]'.
> Asterisk Call Manager/1.0

so using telnet worked but using the Manager API via Asterisk-Java did no=
t.
After some investigation it turned out that the cause of this strange
behaviour was that the Asterisk-Java code tried to connect to 'localhost'=
.
Given the following in /etc/hosts (the default for SuSE Linux):

127.0.0.1       localhost

# special IPv6 addresses
::1             localhost ipv6-localhost ipv6-loopback

localhost could resolve to either 127.0.0.1 or ::1. As Asterisk does not
yet support IPV6 out of the box the Manager API is only available on
127.0.0.1 and not on ::1.
Asterisk-Java currently does not try to connect to every IP that a
hostname may resolve to. So whenever 'localhost' resolved to ::1 it cause=
d
a connection refused.

The solution to this problem is to change /etc/hosts to something like:

127.0.0.1       localhost

# special IPv6 addresses
::1             ipv6-localhost ipv6-loopback

i.e. mapping localhost only to 127.0.0.1.
Another option is to comment out the ::1 completely (if you dont need it
for any other purposes).

=3DStefan