RemoteSyslogAppender doesn't work because of IPv6
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Key: LOG4NET-261
URL: https://issues.apache.org/jira/browse/LOG4NET-261
Project: Log4net
Issue Type: Bug
Components: Appenders
Affects Versions: 1.2.10
Environment: Windows Seven x86_64
Visual Studio Team System unit test
Reporter: Antonio Anzivino
I tried to make experiments with Log4net and Syslog appender for a research
open source project I'm working.
Tried to send the log messages to a local UDP listener using
RemoteSyslogAppender.
Logging code executed but on the debug console I got an exception:
log4net:ERROR [RemoteSyslogAppender] Unable to send logging event to remote
syslog fe80::8038:6515:ad7a:bdb5%15 on port 3434.
System.Net.Sockets.SocketException: Indirizzo utilizzato incompatibile con il
protocollo richiesto [Address used is incompatible with required protocol]
in System.Net.Sockets.Socket.SendTo(Byte[] buffer, Int32 offset, Int32 size,
SocketFlags socketFlags, EndPoint remoteEP)
in System.Net.Sockets.UdpClient.Send(Byte[] dgram, Int32 bytes, IPEndPoint
endPoint)
in log4net.Appender.RemoteSyslogAppender.Append(LoggingEvent loggingEvent)
ALL: 2010-07-06 23:24:11,364 [Agent: adapter run thread for test 'TestMethod'
with id 'f3dfe8eb-635a-4683-8777-a029f3897071'] ERROR ALL [(null)] - Test error
message
RemoteSyslogAppender is trying to send the message to an IPv6 address rather
than 127.0.0.1
Precisely, if I configure <remoteAddress> as "localhost", it tries to send to
::1, if I use "127.0.0.1" it tries to send to an IPv6 link-local address
(fe80:...)
Code can be found at
https://logbus-ng.svn.sourceforge.net/viewvc/logbus-ng/trunk/logbus-core/Log4test/?pathrev=106
as a Visual Studio Unit Test.
It is revision 106 of
https://logbus-ng.svn.sourceforge.net/svnroot/logbus-ng/trunk/logbus-core/Log4test/
I tried to look at RemoteSyslogAppender implementation. I couldn't find a
possible root cause because I can see you correctly initialize the UdpClient
with parameterless constructor (UdpAppender::InitializeConnection()).
The only way I could send datagrams was to use a FQDN as remoteAddress for
which only A record is defined in the DNS.
I also found that the RemoteSyslog appender doesn't respect RFC3164 by default
unless you configure it with an appropriate pattern. I will open a new issue
about it.
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