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96 Chapter 5
Troubleshooting
Troubleshooting Client Connections
n You can also try rpcinfo -t IP_address 395180 Return. This
rpcinfo command gives the response: program 395180
version 1 ready and waiting. If this is not working
properly, see “Troubleshooting Network Configuration”.
3 The Telnet command can be used to verify if a client has network
access to the Gateway as well. If the Telnet command returns the
message: connection refused, the client may not have access
(check the IP allow list configuration values) or the Gateway has run
out of resources and cannot open the Telnet session.
Client Run-time Errors
Common run-time errors that may occur on a client using an E2050
LAN/GPIB Gateway follow.
Message Description
iopen fails:
Invalid address errors
Use the Telnet commands to verify that the GPIB address, GPIB interface
name, and/or GPIB logical unit configuration values are correct.
iopen fails:
No connection
The connection to the LAN/GPIB Gateway failed for one of these reasons:
n A TCP/IP network timeout occurred because the network connection
is down or the Gateway is down.
n The client was denied access to the Gateway because it is not in the
IP allow list. Check the IP allow list configuration values and any error
messages in a syslog file for more information.
n The Gateway has reached its maximum concurrent client connections
and this new connection was refused. Use the Telnet status command
to determine the current Gateway client connection status and check the
syslog file for error messages. You may need to have a client close its
connection or you may need to reboot the Gateway to close all client
connections to allow a new connection to be made.
iopen fails:
Timeout
The client has timed out. The Gateway has not responded within the
appropriate timeout time because:
n The network connection is down or the Gateway is down.
n The server is busy performing an operation for a different client. Use
the Telnet status command to verify the Gateway status. You may
need to increase the Client Timeout Delta configuration value on
the LAN client.