CAST Management Studio - Task Window - Fatal Error - An IO error occurred while sending to the back end

This page will help you to solve issues related to the interruption of the connection after an Analysis.

The fatal error message that appears when the interruption of the connection to the local database occurs is:

An I/O error occurred while sending to the back end.
com.castsoftware.java.ExternalException:An I/O error occured while sending to the backend.

1. Open the CAST-MS log file
2. Search for the error message "An I/O error occurred while sending to the backend."
3. Check for the line "Starting task run X Analyzers" that is before the I/O error message as shown in the below screenshot:
   
4. Check what the interval between the Starting task run analyzer and the I/O error message is.
5. If the interval is very long (more than 1 hour):
   1. Check whether antivirus is enabled. The connection can be interrupted if an antivirus is enabled:
      1. Disable the antivirus
      2. Run the snapshot again
   2. If the issue still exists:
      1. Check if the databases are in the analysis machine (host is local):
         1. In CAST MS, go to the services tab and edit the connection service:
            
         2. If the Host is the name of the machine, replace it by localhost:
            
         3. Run the snapshot
      2. If the databases are not in local machine then
         1. Disable the firewall
         2. Run the snapshot again.
         3. If the issue does not occur, it means that the firewall prevents CAST MS to connect to the local database. Check if there is no restriction to the port of the host.
6. If the problem you are facing does not match any case listed in this page, report your problem to CAST Technical Support and provide the below Relevant input for CAST Technical Support to reproduce the issue.

Relevant input

• CAST Support Tool (CST) - alias Sherlock export with the following options Export Logs, Export Configuration files, Export Computer Environment, Export CAST Bases with Management Base, Knowledge Base, Central base Export source code. 

• Provide screenshots showing the fatal error in the CAST task window as below screenshot: