Question & Answer
Question
What are some methods or commands that can be used to troubleshoot networking issues for Tivoli Workload Scheduler (TWS)?
Answer
There are several tools for checking network connectivity between a TWS Master Domain Manager and its Fault Tolerant Agents.
o The "netstat" command:
This command can be used on UNIX and Windows systems to determine if the required networking processes are active on the system. The syntax "netstat -a |grep {tws/maestro port number}" will show the active processes. A listening process will be associated with the port and two entries, one on the tws/maestro port and one on the tws/maestro port for each connection. Verify that the port numbers on the remote side match the information returned in the nslookup command (see "nslookup" defined below).
# netstat -a |grep 31111
tcp 0 0 *.31111 *.* LISTEN
tcp 0 0 smiley.31111 <connection address> ESTABLISHED
tcp 0 0 smiley.55676 <connection address> ESTABLISHED
#
o The "telnet" command.
Telneting to the system in question on the tws/maestro port will verify it is possible to connect. This connection will time out in a few seconds; this is normal behavior and does not indicate a problem. The inability to connect indicates a problem.
NOTE: This only works for a UNIX system. By default, it is not possible to telnet or FTP into Windows systems, but it is possible to telnet out of Windows systems.
C:\telnet smiley 31111
Connecting to smiley...
Connection to host lost.
C:\>
A refused connection will give the following message:
C:\>telnet smiley 34524
Connecting To smiley
...Could not open a connection to host on port 34524 : Connect failed
o The "nslookup" command.
Nslookup can be used to query the DNS servers for information about the addressing of systems on the network. This information can be compared to the results of telneting by IP address and the results of an ifconfig command (see "ifconfig" defined below).
C:\>nslookup smiley
Server: <server name>
Address: <address>
Name: <name>
Address: <address>
C:\>
o The "ifconfig" command.
Ifconfig will show the IP address a UNIX system believes it is connected on. In an HP-UX environment, use the lan option. For Solaris or AIX, use the -a option.
# ifconfig lan0
lan0: flags=843<UP,BROADCAST,RUNNING,MULTICAST>
inet <address> netmask ffffff00 broadcast <address>
#
Also, see Technote # 1193396 in the "Related information" section below for more network troubleshooting hints.
Related Information
Historical Number
1112607
Product Synonym
Maestro;TWS;TWA;IWS
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Document Information
Modified date:
17 June 2018
UID
swg21156106