strategies to write log file log4j on other server computer

1. Using log4j's SimpleSocketServer
http://stackoverflow.com/questions/15381559/easiest-way-to-send-files-to-a-server/15382152#15382152

In your server you can just start server with the following parameters:

java -cp log4j.jar org.apache.log4j.net.SimpleSocketServer 4712

Here is sample log4j.properties for the server:

log4j.rootLogger=debug, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

Here is sample log4j.properties for the client:

log4j.appender.SERVER=org.apache.log4j.net.SocketAppender
log4j.appender.SERVER.Port=4712
log4j.appender.SERVER.RemoteHost=loghost
log4j.appender.SERVER.ReconnectionDelay=10000

2. Using Linux / Ubuntu rsyslog
http://www.rsyslog.com/doc/master/configuration/modules/imudp.html

Step 1 vi /etc/rsyslog.conf

= = = = = = = Enable UDP (Tested not working) = = = = = = =
# specific ruleset for remote messages
$Ruleset udpremote
*.* /var/log/updremote.log
# switch back to default ruleset
$Ruleset RSYSLOG_DefaultRuleset

# provides UDP syslog reception
$ModLoad imudp
$InputUDPServerBindRuleset udpremote
$UDPServerRun 514

= = = = = = = Enable TCP = = = = = = =
# specific ruleset for remote messages
$Ruleset tcpremote
*.* /var/log/tcpremote.log
# switch back to default ruleset
$Ruleset RSYSLOG_DefaultRuleset

# provides TCP syslog reception
$ModLoad imtcp
$InputTCPServerBindRuleset tcpremote
$InputTCPServerRun 10514

Step 2 service rsyslog restart

Here is sample log4j.properties for the client:

log4j.appender.SYSLOG=org.apache.log4j.net.SyslogAppender
log4j.appender.SYSLOG.SyslogHost=localhost
log4j.appender.SYSLOG.Facility=Local2
log4j.appender.SYSLOG.Header=true
log4j.appender.SYSLOG.layout=org.apache.log4j.PatternLayout
log4j.appender.SYSLOG.layout.ConversionPattern=[%X{ref}] %-5p %C{1}:%L %m%n

Debug SSL communication in Java

For Java program or even web servers (e.g. Tomcat), enable "-Djavax.net.debug=ssl" to view SSL detailed debug message.
- http://stackoverflow.com/questions/9828414/receiving-sslhandshakeexception-handshake-failure-despite-my-client-ignoring-al

SSL process flow
- http://www.digicert.com/news/2011-06-03-ssl-renego.htm

Oracle articles:
https://docs.oracle.com/javase/7/docs/technotes/guides/security/SunProviders.html
https://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html

Understanding the output of the JSSE trace
- http://java.dzone.com/articles/how-analyze-java-ssl-errors
- http://stackoverflow.com/questions/6353849/received-fatal-alert-handshake-failure-through-sslhandshakeexception
Usage of Keytool.exe:
http://mindprod.com/jgloss/keytoolexe.html

HTTP Protocol explained:
http://www.w3.org/Protocols/HTTP/1.1/draft-ietf-http-v11-spec-01
https://www.jmarshall.com/easy/http/
https://en.wikipedia.org/wiki/List_of_HTTP_header_fields