Question about Linksys BEFSR41 Cable/DSL Router W/4 Port Switch, Retail Box (DSLSBEFSR41)

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NIC blinks on then off for longer run lines

I'm in Iraq, trying to set up a VSAT network for a group of soldiers. I have the sat system working fine. I ran cat5e to several locations, when I hook up any location farther than 40 feet from the switch, the lights on their NIC card and on the switch will blink on then off very slowly. The computer on other end will flash the notification that a network cable is unplugged. Is this my cable? I have tested the cable with a pin tester that cycles through all 8 pins on both ends to confirm you attached rj45 properly, according to this I get signal through the wire, it just might not be strong enough or maybe there's interference. This has happened with five different cables. I'm using cat5e utp Have 2 computers on this router. Windows xp on both. Keep receiving this message on only 1 computer, other one is fine. Switched cables & ports on both computers, but still getting same message on this 1 computer. Also using Lynksys modem & tried connecting directly from modem to computer but still got this "unplugged" message. Also tried new NIC card, but made no difference. Sometimes lights on router are on long enough to make the online connection, but sometimes it just blinks on & off too fast so I can't get online. This problem started approx 6 months ago with the "network cable is unplugged" message only showing intermittently. Now it's constant. Any ideas what could have caused this & most importantly, how do I fix it? It's driving me crazy.

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You need to update the firmware of the router then hard reset it.

Download the router's firmware at

After updating the firmware, you need to hard reset the router.

Press the reset button at the back of the router for 30 seconds then unplug the power for 30 secs then plug it back in. That should fix it.

Posted on Aug 08, 2008

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My Dell desktop using Windows XP can't connect to my Belkin 5720 router but my laptop still works?

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Well, there are several options to look at.
First, make sure that your software settings are ok.
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  • Can you ping your router? Open a command prompt (Win-key+R, type cmd and in the next window ping
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Then check the hardware:
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1 Answer

Wireless connection works but no plug in connection

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Try disabling the wireless connection, plug up the cat 5 cable, open a dos prompt and type;
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Notice the information. Now unplug the cable, enable the wireless connection and do the same for the wireless nic. The ip address should be different, but everything else should be the same. Let me know what you find.

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1 Answer

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In order to convert your system to WPA security, you must first make sure all of your hardware is WPA compatible (that isWPA Drivers are available for it).

For your PC wireless connection, if you're running Windows XP you can go to the microsoft website and download the WPA client. It is available in the Microsoft Knowledge Base Article 815485. install the update and reboot. you will then be able to enable WPA security on your client.

Then you'll possibly need to update the drivers for your hardware for WPA support (router, wireless NIC, etc) if they did not already come enabled.

next you get to configure the router for WPA. you'll want to make sure you're set to WPA with preshared keys (no authentication server required), use TKIP as the algorhythm, and leave group key renewal at it's default value. and of course Select a key that is not likely to be guessed. write the key down as you'll need to configure your NIC using it.

to configure your NIC, once you're in the configuration menu select WPA-PSK for your authentication, TKIP for the encryption mode, in data encryption set it to TKIP, and in the network key put the key you selected earlier.

At this point you should be able to access your wireless router (or other access point). These instructions were kind of generic since i do not have the specific router you're using available to me, but the settings i discussed should be pretty universal when it comes to WPA security.

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