doc.FAQ.CannotStopBroker Take the following actions, if you cannot shutdown your Request Broker:Login to the machine that contains your Multi-Tier server components installation. Use a text editor to open the oplrqb.ini file that appears in the /bin sub-directory of the OpenLink installation. Locate the [Request Broker] section. Locate the HostNameResolver parameter. Ensure that there are no semicolons in front of HostNameResolver . Set HostNameResolver No. [Request Broker] BinaryDirectory = c:\openlink\openlink software\uda\multi-tier\v5.0\bin CommandLine = -dv Protocols = tcp ;MaxAgents = 0 ;MaxConnections = 0 HostNameResolver = No Locate the [Security] section. Place a semicolon in front of ShutdownBy and ShutdownFrom . [Security] StartupBy = root, .* ;ShutdownBy = root, .* ;ShutdownFrom = arthur.*, 172.17.250.25, localhost.*,127.0.0.1. Save your changes. Forcibly terminate your Broker will kill or its equivalent. Restart your Request Broker. Test normal shutdown. If the problem persists: Open your server's oplrqb.ini file. Locate the [Security] section. Remove the semicolons from ShutdownBy and ShutdownFrom . Pass *, 127.0.0.1, and the other following values to ShutdownBy and ShutdownFrom . [Security] StartupBy =*, .*, root ShutdownBy = *, .*, root ShutdownFrom = *, *.*, arthur.*, 172.17.250.25, localhost, localhost.*,127.0.0.1 Save your changes. Restart your Request Broker. Test.