Application is not collecting or processing data (syslog, netflow). This is manifested by empty charts and presence of dropped packets in System view of the corresponding application module. This can happen due to low memory, power outage on the server.
Linux Solution
Access the server via ssh and execute the following commands:
Execute commands in strict order to avoid improper application restart. Tomcat service must be started after PostgreSQL for instance.
service tomcat6 stop
service postgresql-9.5 stop
service postgresql-9.5 start
service tomcat6 start
Check the names of your services before attempting stop and start commands.. Names of Tomcat and PostgreSQL services may differ on different installations. For Example Tomcat may be tomcat6 or tomcat7 and PorstgreSQL may be postgresql-9.2 or higher.
Windows Solution
Execute commands in strict order to avoid improper application restart. Tomcat service must be started after PostgreSQL for instance
Stop tomcat Double click on Apache Tomcat Properties in system tray. In General tab, click Stop to stop tomcat service.
2. Stop postgresql Open Command Prompt or Windows PowerShell and type: net stop postgresql-x64-9.5
3. Start postgresql net start postgresql-x64-9.5
4. Start tomcat In General tab of Apache Tomcat Properties, click Start to start tomcat service.
Info
Version 9.5 of PostgreSQL service in these article is an example. Check which version of this service is installed on your server and use this name in the commands listed above. For example, if you have installed Postgresql 9.4 the command 2b will be net stop postgresql-x64-9.4