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- A.1 NCSA Telnet
-
- Error Conditions A.1
-
- National Center for Supercomputing Applications
-
- June 1991
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-
-
- June 1991
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- Appendix A Error Conditions
-
-
-
- Most of the error conditions in NCSA Telnet are nonfatal. The
- most important and common error messages are listed here with a
- short summary of the symptoms and causes.
-
- The following messages may appear on your screen during the
- operation of NCSA Telnet. Any other messages that appear are
- protocol-specific messages that require additional diagnosis from
- the system administrator. If a message that is not documented here
- occurs repeatedly, please contact your system administrator first,
- and if no solution is found, submit a bug report as included in the
- Readme and Bugs pages of this manual.
-
-
- Error in config.tel file
-
- Cause:
- NCSA Telnet will not operate without a configuration file that
- contains the PC's IP address. The program could not find this file.
-
- Solution:
- You can place the configuration file either in the current directory
- or specify it with the -h parameter on the command line. You
- normally customize the file's placement in TELNET.BAT. Your
- system administrator should check your installation and make
- sure the configuration file is there.
-
-
- Host machine not in hosts file
-
- Cause:
- You have entered a machine name that the program can't find in
- the configuration file.
-
- Solution:
- Check that the name you entered was spelled correctly. If you want
- this computer to be accessed by name, add its name and IP address
- to your configuration file.
-
-
- ICMP: Destination unreachable
-
- Cause:
- Another machine╨╨probably the gateway╨╨has determined that
- your message cannot reach its destination from your system.
- Solution:
- Check the IP address in your configuration file. Notify your
- system administrator that the gateway cannot connect you to the
- destination you want to reach. A problem may exist with the
- gateway.
-
-
- ICMP: Echo requested (ping requested)
-
- Cause:
- Someone has "pinged" your machine.
-
- Solution:
- No action is required; you are just being notified that a program on
- another computer has tried to determine if your machine is alive
- and connected to the network. Your machine answered "yes".
-
-
- ICMP: Redirect, another gateway is more efficient
-
- Cause:
- NCSA Telnet is sending packets to a gateway that is reforwarding
- them onto your local network. You will get one of these messages
- for each packet until NCSA Telnet adjusts the local tables and
- automatically switches to the correct gateway.
-
- Solution:
- NCSA Telnet responds to these messages and automatically
- switches to the correct gateway, so you don't have to take any
- action. You may want to change the gateway assignments in your
- configuration file to use a more appropriate gateway. Some
- situations will always produce redirects.
-
-
- Local HOST or gateway not responding
-
- Cause:
- Possible reasons this error occurs are: a network problem, a
- configuration file problem, the computer you want to connect to is
- down, or the gateway that you need is down.
-
- Solution:
- If the computer is on your local network, check to see that the
- network is up and running. If the computer is not on your local
- network, check to see if the gateway is up and running. Ask the
- system administrator to check the specification of the gateway
- (gateway=) in your configuration file. Check the IP number of the
- computer that you are trying to connect to. Check to make sure that
- your computer is attached to the network. Check the integrity of the
- network cable.
-
-
- Memory allocation error, cannot open port
-
- Cause:
- Your system ran out of memory. This reason is the most common
- barrier to opening more sessions.
-
- Solution:
- Log off of some of your sessions or provide more memory in which
- NCSA Telnet can run. Providing more memory may mean
- buying more or rearranging your windowing system to allow
- more memory. NCSA Telnet Version 2.3 requires about 300K of
- memory plus 15K per session. In addition, scrollback requires 86
- bytes per line.
-
-
- Network jammed, probable break in wire
-
- Cause:
- The PC's Ethernet board could not transmit a packet due to a low-
- level hardware error.
-
- Solution:
- The system administrator should ensure that the Ethernet T
- connector or transceiver is correctly connected to the back of your
- PC, then check the integrity of the Ethernet wire according to
- Ethernet specifications. There could be a short circuit in the wire,
- but the usual cause is that the wire has been disconnected
- somewhere.
-
-
- No internal TCP ports available
-
- Cause:
- You are trying to do too many activities at the same time, or some
- combination of your activities has not closed the TCP sessions
- correctly. This error will happen if you open too many sessions to
- other computers.
-
- Solution:
- Close some of your existing sessions. If necessary, exit the
- program by logging off of all of the other computers, then restart
- NCSA Telnet.
-
-
- Packet received for invalid port -- reset sent
-
- Cause:
- Some other computer is sending you packets that NCSA Telnet does
- not expect or understand. This error often happens when you press
- CTRL-SHIFT-F3 to exit NCSA Telnet and then try to start it back
- up again. It can happen under a variety of network breakdown
- conditions.
-
- Solution:
- Do not press CTRL-SHIFT-F3 to exit NCSA Telnet. If you already
- have, or some other network breakdown caused the problem, the
- other computer will eventually time out and stop sending you the
- extra packets. If you continue to receive them, notify your system
- administrator.
-
-
- Reset received: syn sent
-
- Cause:
- The machine to which you are attempting to connect is refusing
- your telnet connection.
-
- Solution:
- Check to see why that machine is not up and running. If it is, check
- your configuration file to see if you are using the correct IP
- number.
-
-
- Domain Look-up failed for: <machine>
-
- Cause:
- The nameservers you've specified in the hosts file are not aware of
- the machine. Also, you may have misspelled a machinename.
-
- Solution:
- Check the spelling of the name you've entered. If you've entered
- the name correctly, add that machine to your host configuration
- file. Alternatively, you may want to add another machine as a
- nameserver in your host file.
-