I have that error with the new Katalon version 7.0.10:
Network Error (tcp_error)
A communication error occurred: “Operation timed out”
The Web Server may be down, too busy, or experiencing other problems preventing it from responding to requests. You may wish to try again at a later time.
Transaction ID: 9b8c38c70ebfd177-000000004ad6a97b-000000005dd6e482
For assistance, contact your network support team.