I have a HP2550N printer that is connected to a Linksys WRT400N but nothing can see it. Help?

WEP is a type of security : http://en.wikipedia.org/wiki/Wireless_security As to the Dual -Band setup, 2.4 - 5 Ghz. : http://homesupport.cisco.com/en-us/support/routers/WRT400N

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For you to be able to do that, you will need to set the SMC router to bridge mode, you will not be able to do that by yourself because only tech from your ISP have the capability of doing that since they have this tool that can operate on the router setting it to bridgemode. Basically, you will need to call your ISP to set the router to bridgemode and from there, you will be able to configure the linksys router.
Hope this information will help.

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Try reflashing the router, the firmware is available here: http://homedownloads.cisco.com/downloads/firmware/WRT400N_1.0.02_Build_11.bin
If that does not correct the issue, try physically moving the router away from any sources of heat, as that can also cause the issue.

NO.But give a try to Password RevealerPassword Revealer (only 65 kB - Windows 95/98/Me/NT) is a utility that can show you most passwords that are typed in a password edit box (those that hide ...
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Reset There are two ways to reset the Router's

factory defaults. Either press and hold the Reset

Button for approximately five seconds, or restore

the defaults from Administration > Factory
Defaults in the Router's web-based utility.

There should be a small hole with a red circle around it on the back of the router next to the power plug hole. Use a pin or straighten paper clip to push the tiny button.

The WEP encryption key (network key) is in your wireless router, without this key the wireless router won't allow the computer or laptop to connect to this wireless router.
I recommend you use WPA or WPA2 encryption, it is much stronger than WEP.
The WEP, WPA, WPA2 encryption key is in your router's wireless settings. Log into your router and got to the wireless settings, you will need to get the SSID and the encryption key. Then go to your computer or laptop's wireless card and configure it with the router's SSID and encryption key, so it will then connect to the wireless router and the Internet.

To secure your wireless network from unauthorized access,please click on this link and follow my instructions :-http://www.fixya.com/support/r3559128-wireless_router_security.

You need the Ethernet Cable in your Router to be able to connect to the Internet.That is the only way your going to be able to have Internet.It will not work without the Ethernet cable.

you said every thing that connects with the ethernet is working. that means the wired part of the router is working. check the wireless settings of the router. Open the set up page of the router on the main computer. connect the main computer to the router with the ethernet cable.
change the wireless settings of the router.
WRT400N is a dual band router ( 2.4 GHZ and 5 GHZ)
You can create 2 different wireless networks. Make sure that the names (SSID) will be different for both the networks. For 2.4 GHZ change the standard channel to 6 and save the settings.
Go to wireless security and set the security mode to WPA Personal. set up password for the wireless network. You can use the same password for both the networks. Make sure that the Wireless MAC address is disabled.
Now try to connect to the new wireless network. and see what happens.
Click here for more information about routers

here is the link to the user manual ...if you changed the admin password and cannot get in you will have to reset the router and put all new settings back in

the default user name is : wrt400 or wrt400n
and default password is admin
To access the web-based utility, launch the web browser on
your computer, and enter the Router’s default IP address,
192.168.1.1 or http://wrt400n.com in the Address field.
Then, press Enter.
A password request screen will appear. (Non-Windows XP
users will see a similar screen.) Leave the User name field
blank. The first time you open the web-based utility, use
the default password admin. (You can set a new password
on the Administration > Management screen.) Click OK to
continue.

http://www.abt.com/images/products/PDF_Files/wrt400n_manual.pdf

My friend, current technology does not allow for these speeds via wireless. Wire is rated at 100 (cat 5) or 1000 (cat 6) while wireless is 10. Your Linksys will communicate with your modem device at the higher rate, but the wireless will be slower.

To get the 1000 speed, all devices attached to your 1000 rated network will have to be rated 1000; computers, printers, routers, etc. You must also use category 6 or higher cable to get that speed. If you have any device on a 1000 rated network that is rated at a slower speed, everything will slow down to that slower speed.

I am not a wireless fan for two reasons: (1) Speed (2) security. Normally, distance is not a problem - Current technology allows for a 300 foot radius circle around your router (perfect circumstances)

Now then, the salesman may tell you something else and there may be another question catcher come in and tell you something else. My comments are based on my own personal experience while operating my own networks.

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