Resolution: Customer was monitoring a directory with more than 400.000 files inside, so it was needed to increment the UNIXSSHTimeoutSeconds
1. Stop SiteScope Server
2. Increase time for the parameter UNIXSSHTimeoutSeconds=60 to 500
3. Start the SiteScope Service.
4. Go to Properties tab and select Server Side Processing Checkbox.(This will process the log file on the server side)
5. Save the changes and run the monitor.