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TCPIP_ACCEPT_NONBLOCK Statement

The TCPIP_ACCEPT_NONBLOCK statement specifies whether the TCP/IP ports on which the PowerExchange Listener listens are blocking or nonblocking ports.

Define TCPIP_ACCEPT_NONBLOCK=Y if the following conditions apply:

You perform a security check by using a port scanner such as Nessus.

The PowerExchange Listener appears to hang indefinitely on the main Listener port or ignore commands.

A Listener port for a netport job is defined.

z/OS

TCPIP_ACCEPT_NONBLOCK={N|Y}

N
.
PowerExchange Listener listening ports are blocking ports. When a blocking port is accessed, it blocks other attempts to access the port.

Y.
PowerExchange Listener listening ports are nonblocking ports.

Default is N.

If you perform a security check by using a port scanner such as Nessus, the PowerExchange Listener might hang indefinitely on the main Listener port or ignore commands if a Listener port for a netport job is also defined. The problem occurs when a call to the TCPIP accept() function on the netport port is blocked until a connection is present. While the netport port is blocked, the main PowerExchange Listener port is never polled, so that non-netport requests appear to be hung. The Listener remains in this state until a subsequent netport request unblocks the netport port.

If this situation occurs, include the TCPIP_ACCEPT_NONBLOCK=Y statement in the DBMOVER configuration file on the Listener machine. This statement makes the PowerExchange Listener listening ports nonblocking, so that the accept() call can return a suitable status if it fails.

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TCPIP_ACCEPT_NONBLOCK Statement

TCPIP_ACCEPT_NONBLOCK Statement