Problem: Service Configuration Error Messages
Occasionally, during bootup of Cisco hardware through Cisco IOS software, error messages similar to these
are displayed:
· %Error opening tftp://255.255.255.255/network−confg (Socket error)
· %Error opening tftp://255.255.255.255/cisconet.cfg (Socket error)
· %Error opening tftp://255.255.255.255/3620−confg (Socket error)
· %Error opening tftp://255.255.255.255/3620.cfg (Socket error)
These error messages are related to the default service configuration option built into Cisco IOS software,
Solution
In order to disable this feature, issue the no service config global command.
Router#config terminal
Enter configuration commands, one per line.
Router(config)#no service config
Router(config)#exit
Router#copy running−config startup−config
These error messages no longer appear at the next bootup of the router.
You can read the complete solution at :http://www.cisco.com/application/pdf/paws/49683/serviceconfig-error-msgs.pdf
Thursday, May 29, 2008
Saturday, May 24, 2008
FREE CCNA LAB
If you are preparing for a CCNA exam, please feel free to email me and I will give you access to my home lab. I have 6 routers and 2 switches.
You will be able to practice whatever you want.
Also, If you are looking to purchase a ccna lab, let me know.
You will be able to practice whatever you want.
Also, If you are looking to purchase a ccna lab, let me know.
Connection refused by remote host
"Connection refused by remote host" is the message I got this morning after trying to connect to my frame relay router from my Access server.
I received this message because I left an active connection to the frame relay last night and unplug my cat5 cable from the wireless router to the lab lan. I was using my laptop to ssh to the as server. So, this morning my AS believe I still have an active connection to the FR.
Here is what I did to have access to my fr.
From the AS server:
AS# clear line 0
AS# clear line 1
I did not know what line to clear, so I clear line 0 and line 1
and that all I did and now I have access.
But here is the solution cisco recommend to avoid this kind of problem (http://www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a00801365f3.shtml)
This topology allows for a remote terminal user to gain access to a server across a network using an autocommand telnet in the configuration of Router 2.
If, however, Router 2 is reloaded for any reason, the terminal will not be able to get back into the server. Upon attempting to activate the connection, the user will see a "Connection refused by remote host" message. This message appears because the server believes that the previous telnet session is still connected, thus blocking a new session.
This situation could be remedied by a network administrator by issuing the clear line command on Router 1, but this approach has two major shortcomings:
Network administrators may be unavailable to clear the line when needed.
For security reasons, the enable password command is not likely to be given out to users.
One solution is for Router 1 to clear the TTY line when the connection to Router 2 is lost for any reason. TCP keepalives can resolve this problem. Turn on TCP keepalives on both routers so that one router will notice when the connection to the other router goes away; otherwise, the far end has no way to know that a reboot or other connection loss has happened.
To enable TCP keepalives on the routers, use the following configuration commands:
Router1# config term
Router1(config)# service tcp-keepalives-in
Router1(config)# service tcp-keepalives-out
Router1(config)# end
I received this message because I left an active connection to the frame relay last night and unplug my cat5 cable from the wireless router to the lab lan. I was using my laptop to ssh to the as server. So, this morning my AS believe I still have an active connection to the FR.
Here is what I did to have access to my fr.
From the AS server:
AS# clear line 0
AS# clear line 1
I did not know what line to clear, so I clear line 0 and line 1
and that all I did and now I have access.
But here is the solution cisco recommend to avoid this kind of problem (http://www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a00801365f3.shtml)
This topology allows for a remote terminal user to gain access to a server across a network using an autocommand telnet in the configuration of Router 2.
If, however, Router 2 is reloaded for any reason, the terminal will not be able to get back into the server. Upon attempting to activate the connection, the user will see a "Connection refused by remote host" message. This message appears because the server believes that the previous telnet session is still connected, thus blocking a new session.
This situation could be remedied by a network administrator by issuing the clear line command on Router 1, but this approach has two major shortcomings:
Network administrators may be unavailable to clear the line when needed.
For security reasons, the enable password command is not likely to be given out to users.
One solution is for Router 1 to clear the TTY line when the connection to Router 2 is lost for any reason. TCP keepalives can resolve this problem. Turn on TCP keepalives on both routers so that one router will notice when the connection to the other router goes away; otherwise, the far end has no way to know that a reboot or other connection loss has happened.
To enable TCP keepalives on the routers, use the following configuration commands:
Router1# config term
Router1(config)# service tcp-keepalives-in
Router1(config)# service tcp-keepalives-out
Router1(config)# end
Sunday, May 18, 2008
HOW TO HAVE 7 STATIONS FOR 1 PC
Ncomputing is the best solution for cybercafe.
Watch this video and you see the benefit of ncomputing x300.
Watch this video and you see the benefit of ncomputing x300.
Saturday, May 17, 2008
how to configure a ncomputing system
Each X300 kit includes:
Desktop virtualization software
PCI card with three ports
Three access devices
(You need to supply the PC, application software, keyboards, mice and monitors.)
Installation is simple. Install the PCI card into an open slot. Next, plug one end of each cable into the card and the other end into an NComputing access device. Even though standard Cat 5 UTP or Cat 6 STP cables are used, they don’t carry Ethernet signals. (That’s why they can’t be longer than 5 or 10 meters, respectively.) The cables do supply the power—as well as the monitor, keyboard, mouse, and audio signals—to the access device. That means no separate power adapters, which you’ll find incredibly convenient. Now connect the keyboards, monitors, and mice to the NComputing access devices.
Power up the system and install the software. You now have four users sharing one computer.
Install a second X300 kit and you get 7 users on 1 PC.
HERE IS THE CONFIGURATION VIDEO
Desktop virtualization software
PCI card with three ports
Three access devices
(You need to supply the PC, application software, keyboards, mice and monitors.)
Installation is simple. Install the PCI card into an open slot. Next, plug one end of each cable into the card and the other end into an NComputing access device. Even though standard Cat 5 UTP or Cat 6 STP cables are used, they don’t carry Ethernet signals. (That’s why they can’t be longer than 5 or 10 meters, respectively.) The cables do supply the power—as well as the monitor, keyboard, mouse, and audio signals—to the access device. That means no separate power adapters, which you’ll find incredibly convenient. Now connect the keyboards, monitors, and mice to the NComputing access devices.
Power up the system and install the software. You now have four users sharing one computer.
Install a second X300 kit and you get 7 users on 1 PC.
HERE IS THE CONFIGURATION VIDEO
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