There are no clients reporting under virus definition distribution.

Did you do any recent changes, check communication on one of your client.
if everything is fine with the client, then run a repair install

Sometimes having IE Enhanced Security may cause this, I would suggest the
following:

-Open the Control Panel
-Open Add or Remove Programs
-Select Add or
Remove Windows Components
-From within the list uncheck Internet Explorer
Enhanced Security Configuration
-Click Next
-Click Finish
One more possibility is there may be some issue with database.. Try by  database validation tool.

Hello Bekir
in the first picture we can see computers which autoprotect-off tamper protection is off etc.
I think so some database tables corrupt.
have you got a backup for turn back?
Thanks
Fatih.

hi,

dbvalidator logs that "Database validation passed".

We've tried removing Enhaced security options as well. It didn't work.,

Communication on the clients are good. There are around 500 clients updating their definitions from this manager. Clients tab in the manager console looks fine.

We do not have a backup to recover.

Any other ideas about the issue?

Thanks

Try to use a remote console on a different machine.

Any error present in log files(scm-server-0.log,IIS logs,out.log or in event viewer) ? 

Hello all,

We've tried the remote console on a different machine, same thing happens. That means the information is provided by the DB and it shouldn't be anything about IIS.

scm-server-0.log is full of Java Exceptions like this:
2009-10-26 09:08:10.662 SEVERE: Unknown Exception in: com.sygate.scm.server.task.ScheduledReportingTask
java.io.IOException: Not in GZIP format
    at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:137)
    at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:58)
    at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:68)
    at com.sygate.scm.server.task.ScheduledReportingHelper.doRequest(ScheduledReportingHelper.java:379)
    at com.sygate.scm.server.task.ReportWriter.generateReport(ReportWriter.java:86)
    at com.sygate.scm.server.task.ScheduledReportingTask.generateReport(ScheduledReportingTask.java:186)
    at com.sygate.scm.server.task.ScheduledReportingTask.run(ScheduledReportingTask.java:139)
    at java.util.TimerThread.mainLoop(Timer.java:512)
    at java.util.TimerThread.run(Timer.java:462)

I'll file a case for this. But of course it would be nice to hear if you have any ideas.

Thanks

Try by clearing the transaction log
Steps to clear the transaction log:
Backup DB
Detach DB
Rename Log file
Attach DB
New log file will be recreated