I know myself slowly no more advice

We have here a again new-installed scalix11 system under debian/etch. Webmail with htp://...:9090/webmail is ok; but http:/...:9090/sac failed:
"Anmeldung konnte nicht durchgeführt werden, Konfiguratiuonsdaten konnten nicht geladen werden, ein Problem mit dem Administrationsserver ist aufgetreten" (login failed; cant' load konfig-data; a problem with the administration server is present...)
# omstat -s
Service Router Started 17.07.07 0
Local Delivery Started 17.07.07 0
Internet Mail Gateway Started 17.07.07 0
Local Client Interface Enabled 17.07.07 0
Remote Client Interface Enabled 17.07.07 0
Test Server Started 17.07.07 0
Request Server Started 17.07.07 0
Print Server Started 17.07.07 0
Bulletin Board Server Started 17.07.07 0
Background Search Service Started 17.07.07 0
CDA Server Started 17.07.07 0
POP3 interface Started 17.07.07 0
Omscan Server Started 17.07.07 0
Archiver Started 17.07.07 0
#omstat -a
PC Monitor Started NON-STOP 0
Directory Relay Server Started 17.07.07
Notification Server Started 17.07.07 0
Shared memory daemon Started NON-STOP
Notification Monitor Started NON-STOP
Session Monitor Started NON-STOP
Indexer Started NON-STOP
Stats Daemon Started NON-STOP
Container Access Monitor Started NON-STOP
Item Structure Server Stopped
Database Monitor Started 17.07.07
Licence Monitor Daemon Started NON-STOP
LDAP Daemon Started 17.07.07
Queue Manager Started NON-STOP
Item Delete Daemon Started NON-STOP
IMAP Server Daemon Started 17.07.07
SMTP Relay Started 17.07.07
Mime Browser Controller Started 17.07.07
Event Server Started 17.07.07
#cat /var/opt/scalix/s8/tomcat/logs/catalina.out
18.07.2007 07:24:22 org.apache.jk.common.MsgAjp processHeader
SCHWERWIEGEND: BAD packet signature 20559
18.07.2007 07:24:22 org.apache.jk.common.ChannelSocket processConnection
SCHWERWIEGEND: Error, processing connection
java.lang.IndexOutOfBoundsException
at java.io.BufferedInputStream.read(Unknown Source)
at org.apache.jk.common.ChannelSocket.read(ChannelSocket.java:626)
at org.apache.jk.common.ChannelSocket.receive(ChannelSocket.java:583)
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:691)
at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:895)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Unknown Source)
18.07.2007 07:24:22 org.apache.jk.common.MsgAjp processHeader
SCHWERWIEGEND: BAD packet signature 20559
18.07.2007 07:24:22 org.apache.jk.common.ChannelSocket processConnection
SCHWERWIEGEND: Error, processing connection
java.lang.IndexOutOfBoundsException
at java.io.BufferedInputStream.read(Unknown Source)
at org.apache.jk.common.ChannelSocket.read(ChannelSocket.java:626)
at org.apache.jk.common.ChannelSocket.receive(ChannelSocket.java:583)
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:691)
at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:895)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Unknown Source)
#omshowu sxadmin
Authentication ID: sxadmin
Globally Unique ID: 150000005121d964-461.302.911.78
User Name : sxadmin /CN=sxadmin
MailNode : server38/mobilephone24;com
Internet Address : "sxadmin" <sxadmin@mobilephone24.com>
System Login : 60534
Password : set
Admin Capabilities : YES
Mailbox Admin Capabilities : NO
Language : C
Mail Account: Unlocked
Last Signon : 18.07.07 07:24:34
Receipt of mail : ENABLED
Service level : 0
Excluded from Tidying : NO
Recovery Folder visible : NO
User Class : Limited
SIS URL : sxidx://server38.mobilephone24.com/0500 ... 302.911.78
JAVA-Version at present jre1.5.0_11 (from scalix-11.1.0-GA-debian-intel.tgz), scalix-tomcat run at port 8009; web at port 9090
Do you have ideas which be could?
What meant "BAD packet signature 20559 "?
Can one if necessary later load a license in without the sac interface?
Greetiings
S..