NS3000/iX Error Messages Reference Manual (36923-90041)

108 Chapter10
Network Transport Protocol (PMERR) Error Messages
MESSAGE: RETRANSMISSION RETRIES EXCEEDED
-80 CAUSE: A TCP connection did not receive any acknowledgment from
the remote connection half for a data packet within the configured
number of retransmissions.
ACTION: There are many possible reasons for a retransmission time
out to occur. Potential problems include severe network bottlenecks,
remote system CPU starvation, incorrect or improperly tuned
configuration, remote node failure, gateway or network failure, and
servers which are not processing new connection requests (or which are
becoming backlogged). Check for remote system and network failure
first. If there is no problem reaching the remote system, then the
problem is most likely a system or network load problem. Check CPU
usage on remote system and/or network traffic capacity especially at
gateways or over slow (non-LAN) links. Also, if the problem is at
connect time, check that the remote server is processing connection
requests in a timely manner. Also see the NS 3000/iX NMMGR Screens
Reference Manual for a discussion on tuning TCP retransmission
parameters.
MESSAGE: RETRANSMISSION TIMEOUT EXCEEDED
-81 CAUSE: A TCP connection did not receive any acknowledgment from
the remote connection half for a data packet within the configured
MAXIMUM TIME TO WAIT FOR REMOTE RESPONSE.
ACTION: There are many possible reasons for a retransmission time
out to occur. Potential problems include severe network bottlenecks,
remote system CPU starvation, incorrect or improperly tuned
configuration, remote node failure, gateway or network failure, and
servers which are not processing new connection requests (or which are
becoming backlogged). Check for remote system and network failure
first. If there is no problem reaching the remote system, then the
problem is most likely a system or network load problem. Check CPU
usage on remote system and/or network traffic capacity especially at
gateways or over slow (non-LAN) links. Also, if the problem is at
connect time, check that the remote server is processing connection
requests in a timely manner. Also see the NS 3000/iX NMMGR Screens
Reference Manual for a discussion on tuning TCP retransmission
parameters.
MESSAGE: CONNECTION ASSURANCE TIMEOUT
-82 CAUSE: A TCP connection has not received any acknowledgment from
the remote connection half within the configured number of connection
assurance retries; therefore we assume that the remote system half has
experienced an abrupt termination.
ACTION: Check for remote system failure or network failure. If both
the network and the remote system are intact, you may wish to
readjust the time out parameters, or disable the connection assurance
function by configuring a maximum of zero retries.