$ lsb_release -idrc
Distributor ID: Debian
Description:    Debian GNU/Linux 5.0.8 (lenny)
Release:        5.0.8
Codename:       lenny

$ java -version
java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
Java HotSpot(TM) Client VM (build 16.3-b01, mixed mode, sharing)

$ apt-show-versions -r -p 'jenkins.*|apache2.*|libapache2-.*' | column -t
apache2/lenny                     uptodate  2.2.9-10+lenny9
apache2-doc/lenny                 uptodate  2.2.9-10+lenny9
apache2-mpm-prefork/lenny         uptodate  2.2.9-10+lenny9
apache2-utils/lenny               uptodate  2.2.9-10+lenny9
apache2.2-common/lenny            uptodate  2.2.9-10+lenny9
jenkins/binary                    uptodate  1.408
libapache2-mod-auth-mysql/lenny   uptodate  4.3.9-11
libapache2-mod-auth-openid/lenny  uptodate  0.3-2
libapache2-mod-encoding/lenny     uptodate  20040616-5
libapache2-mod-fcgid/lenny        uptodate  1:2.2-1+lenny1
libapache2-mod-geoip/lenny        uptodate  1.1.8-2
libapache2-mod-php5/lenny         uptodate  5.2.6.dfsg.1-1+lenny10
libapache2-mod-python/lenny       uptodate  3.3.1-7
libapache2-mod-wsgi/lenny         uptodate  2.5-1~lenny1

$ find /etc/apache2/mods-enabled/ -name '*.load' | sed 's|.*/||' | sort | column
alias.load              authz_user.load         geoip.load              rewrite.load
auth_basic.load         autoindex.load          mime.load               setenvif.load
auth_mysql.load         cgi.load                negotiation.load        status.load
authn_file.load         deflate.load            php5.load               wsgi.load
authz_default.load      dir.load                proxy_http.load
authz_groupfile.load    env.load                proxy.load
authz_host.load         fcgid.load              python.load

$ cat /etc/apache2/conf.d/jenkins.conf
ProxyPass         /jenkins  http://localhost:8080/jenkins
ProxyPassReverse  /jenkins  http://localhost:8080/jenkins

# Local reverse proxy authorization override
# Most unix distribution deny proxy by default (ie /etc/apache2/mods-enabled/proxy.conf in Ubuntu)
<Proxy http://localhost:8080/jenkins*>
  Order deny,allow
  Allow from all
</Proxy>

$ java -jar jenkins-cli.jar -s http://localhost/jenkins/ version
Exception in thread "main" java.io.IOException: Premature EOF
        at sun.net.www.http.ChunkedInputStream.readAheadBlocking(ChunkedInputStream.java:538)
        at sun.net.www.http.ChunkedInputStream.readAhead(ChunkedInputStream.java:582)
        at sun.net.www.http.ChunkedInputStream.read(ChunkedInputStream.java:669)
        at java.io.FilterInputStream.read(FilterInputStream.java:116)
        at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:2512)
        at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:2507)
        at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:2496)
        at hudson.remoting.Channel.<init>(Channel.java:386)
        at hudson.remoting.Channel.<init>(Channel.java:348)
        at hudson.remoting.Channel.<init>(Channel.java:309)
        at hudson.remoting.Channel.<init>(Channel.java:305)
        at hudson.remoting.Channel.<init>(Channel.java:293)
        at hudson.cli.CLI.<init>(CLI.java:92)
        at hudson.cli.CLI.<init>(CLI.java:63)
        at hudson.cli.CLI.main(CLI.java:182)

$ cat /var/log/jenkins/jenkins.log
Apr 23, 2011 8:50:30 AM hudson.remoting.Channel$ReaderThread run
SEVERE: I/O error in channel HTTP full-duplex channel 5a8a8941-e820-4b03-a52e-5f45c4112afc
java.net.SocketException: Connection reset
	at java.net.SocketInputStream.read(SocketInputStream.java:168)
	at java.net.SocketInputStream.read(SocketInputStream.java:182)
	at winstone.WinstoneInputStream.read(WinstoneInputStream.java:49)
	at hudson.util.ChunkedInputStream.getChunkSizeFromInputStream(ChunkedInputStream.java:223)
	at hudson.util.ChunkedInputStream.nextChunk(ChunkedInputStream.java:197)
	at hudson.util.ChunkedInputStream.read(ChunkedInputStream.java:120)
	at java.io.ObjectInputStream$PeekInputStream.peek(ObjectInputStream.java:2249)
	at java.io.ObjectInputStream$BlockDataInputStream.peek(ObjectInputStream.java:2542)
	at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2552)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1297)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
	at hudson.remoting.Channel$ReaderThread.run(Channel.java:992)

$ java -jar jenkins-cli.jar -s http://localhost:8080/jenkins/ version
1.408