Any idea please ? :S
A better way to proceed can be checking the logs to see where the disconnect is happening.
If you can see any errors, you can ask that.
Which log file should I look specifically? nqserver or biserver? I already see these log files but I do not understand where to look. Those files are huge and writes lots of things :S I am mixed and try to find more specific way to succeed
Try reviewing: bi_server1.log, bi_server1-diagnostic.log, and bi_server1.out. They should be in: [$FMW_HOME]/user_projects/domains/bifoundation_domain/servers/bi_server1/logs. These are the logs for the OBIEE managed server, itself. I think this is what you'll want. This is the java component. https://gerardnico.com/wiki/weblogic/java_component
The nqserver, along with others, like nquery, sawlog, etc. are system components (non-java). Logs are under the $INSTANCE_TOP ...
As suggested by Charles, please check the log files of both Admin Server and BI_Server: especially the bi_server.out.
you can see the logs present at end of the file (match it with your server timestamp and check the logs). You will definitely get some idea about the issue.
Let us know if you find something that is useful.
Ok, I will monitor these files. But bi_server1.out file does not exist for recent. For example, my problem occurred at 22 October, but no file exists for this date. :S An older version we have, which has 18 october :S Is this normal?
Just to point sth out here that no one has considered yet.
Since you dont specify WHAT exactly goes down but you say it haopens when doing BIP ... And BIP being java versus OBI being C++ ... Then maybe your problem is BIP and you must look at that component. Not the OBI components.
Check WebLogic as well, you may have some stuck threads:
Oracle Support Document 1906192.1 (OBIEE 11g: Troubleshooting Stuck Threads or Hangs) can be found at: https://support.oracle.com/epmos/faces/DocumentDisplay?id=1906192.1