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Full Discussion: Telnet Problem
Top Forums UNIX for Dummies Questions & Answers Telnet Problem Post 302194261 by era on Monday 12th of May 2008 02:42:04 PM
Old 05-12-2008
Is there some sort of pattern to "certain addresses"? That would indicate a routing problem, perhaps external to the machine itself. Do other things besides telnet work? What about ping, traceroute, ssh?

Are you using DHCP? Did the machine's IP address change, like, for instance, not so coincidentally around the time the problems started?

Do you have working reverse DNS, and do the other machines possibly care whether or not you do? Is there anything else on their end which might be preventing the connections?
 

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FENCE_AGENT(8)						      System Manager's Manual						    FENCE_AGENT(8)

NAME
fence_apc - Fence agent for APC over telnet/ssh DESCRIPTION
fence_apc is an I/O Fencing agent which can be used with the APC network power switch. It logs into device via telnet/ssh and reboots a specified outlet. Lengthy telnet/ssh connections should be avoided while a GFS cluster is running because the connection will block any necessary fencing actions. fence_apc accepts options on the command line as well as from stdin. Fenced sends parameters through stdin when it execs the agent. fence_apc can be run by itself with command line options. This is useful for testing and for turning outlets on or off from scripts. Vendor URL: http://www.apc.com PARAMETERS
-a, --ip=[ip] IP Address or Hostname This parameter is always required. -l, --username=[name] Login Name This parameter is always required. -p, --password=[password] Login password or passphrase -c, --command-prompt=[prompt] Force Python regex for command prompt (Default Value: ['0', '0pc>']) -x, --ssh SSH connection -n, --plug=[id] Physical plug number, name of virtual machine or UUID This parameter is always required. -s, --switch=[id] Physical switch number on device -u, --ipport=[port] TCP/UDP port to use (default 23, 22 if --ssh TCP/UDP port to use for connection with device (Default Value: 23) -4, --inet4-only Forces agent to use IPv4 addresses only -6, --inet6-only Forces agent to use IPv6 addresses only -S, --password-script=[script] Script to retrieve password -k, --identity-file=[filename] Identity file for ssh --ssh-options=[options] SSH options to use (Default Value: -1 -c blowfish) -o, --action=[action] Fencing Action (Default Value: reboot) -v, --verbose Verbose mode -D, --debug-file=[debugfile] Write debug information to given file -V, --version Display version information and exit -h, --help Display help and exit -C, --separator=[char] Separator for CSV created by operation list (Default Value: ,) --power-timeout=[seconds] Test X seconds for status change after ON/OFF (Default Value: 20) --shell-timeout=[seconds] Wait X seconds for cmd prompt after issuing command (Default Value: 3) --login-timeout=[seconds] Wait X seconds for cmd prompt after login (Default Value: 5) --power-wait=[seconds] Wait X seconds after issuing ON/OFF (Default Value: 0) --delay=[seconds] Wait X seconds before fencing is started (Default Value: 0) --retry-on=[attempts] Count of attempts to retry power on (Default Value: 1) ACTIONS
on Power on machine. off Power off machine. reboot Reboot machine. status This returns the status of the plug/virtual machine. list List available plugs with aliases/virtual machines if there is support for more then one device. Returns N/A otherwise. monitor Check the health of fence device metadata Display the XML metadata describing this resource. STDIN PARAMETERS
ipaddr IP Address or Hostname This parameter is always required. login Login Name This parameter is always required. passwd Login password or passphrase cmd_prompt Force Python regex for command prompt (Default Value: ['0', '0pc>']) secure SSH connection port Physical plug number, name of virtual machine or UUID This parameter is always required. switch Physical switch number on device ipport TCP/UDP port to use for connection with device (Default Value: 23) inet4_only Forces agent to use IPv4 addresses only inet6_only Forces agent to use IPv6 addresses only passwd_script Script to retrieve password identity_file Identity file for ssh ssh_options SSH options to use (Default Value: -1 -c blowfish) action Fencing Action (Default Value: reboot) verbose Verbose mode debug Write debug information to given file version Display version information and exit help Display help and exit separator Separator for CSV created by operation list (Default Value: ,) power_timeout Test X seconds for status change after ON/OFF (Default Value: 20) shell_timeout Wait X seconds for cmd prompt after issuing command (Default Value: 3) login_timeout Wait X seconds for cmd prompt after login (Default Value: 5) power_wait Wait X seconds after issuing ON/OFF (Default Value: 0) delay Wait X seconds before fencing is started (Default Value: 0) retry_on Count of attempts to retry power on (Default Value: 1) fence_apc (Fence Agent) 2009-10-20 FENCE_AGENT(8)
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