D-link DGL-4500 is not accessing my dsl modem

There is no limit to the number of login attempts, as far as I know, but there are ways to block hackers outside of your network...

You can use MAC Filters (Media Access Control) to allow LAN (Local Area Network) computers by their MAC addresses access to the Network (p. 44 in the user manual).

You can also use the built-in Firewall Settings for protection from the outside world (p. 45 in the user manual).

There is also an Access Control Wizard (p. 40 in the user manual).

Here is the PDF link to the User Manual:
http://www.dlink.com/-/media/Consumer_Products/DGL/DGL%204500/Manual/DGL%204500_Manual_EN_US.pdf

Make sure you have the latest firmware as this might help with your dropped connections. Also try to make a DHCP Reservation for each computer connected to your network (p. 32 in the User Manual), as that can also help prevent dropped connections.

Download the latest firmware ver. 1.23NA to your local computer. Connect your DGL-4500 router via a wired connection (ethernet) to your computer and install the firmware update following instructions in the user manual.

Firmware link:
ftp://ftp.dlink.com/Gateway/dgl4500/firmware/dgl4500_FW_123NA.zip

Here is the PDF link to the User Manual:
http://www.dlink.com/-/media/Consumer_Products/DGL/DGL%204500/Manual/DGL%204500_Manual_EN_US.pdf

I have used Cat5e plenum Cable for my internet connection and I faced same problem. If you are just concerned with internet access and not access between devices on your LAN, then you just need to connect the first router LAN to the WAN port of the second router with the mentioned Ethernet cable. It is also in your best interest to make sure the IP ranges are different between the two DHCP servers you now have. That is, make sure they are not on the same subnet or serving up conflicting IP's.

If there was a code to unlock it please get help where you bought it. And please test it before you leave the counter.

Do a manual setup. Look at the instruction booklet and access the router from a browser.

i think its working.Connect the ethernet port of moden to wlan of wireless

Check the IP address of the computer.
If you aer getting the Ip address on the computer then try to ping the router.
You have changed the ISP. there is difference between the cable and DSL service provider. settings are different.
You will need to set up the router from the start.
Click Here for more info about how to set up the router

Download the official manual (in PDF format) here: ftp://ftp.dlink.com/Gateway/dgl4500/Manual/dgl4500_manual_11.zip

And refer to page 15 (time setup). In short, login to the D-link web-interface, choose 'Tools' and then 'Time', adjust it and press the 'Save Settings' button ...

1. I assume you downloaded the newest firmware (version 1.21NA) from this site.
2. Save or move it on your desktop so it's easier to find.
   
3. Connect your router to your computer with an Ethernet cable.(If you're not sure what it looks like, see here.)
   

Do not upgrade the firmware over a wireless connection!

On the same page, look at the FAQ's. there is an entry called "How do I upgrade the firmware on my DGL-4100/DGL-4300/DGL-4500?" It is a description of the upgrade process itself and will walk you through the steps.

I'm just amazed that they miss a really important warning. Do not unplug your router or close the browser on your computer until this process is finished. This can render your router useless and you will have a nice, expensive doorstop.
When the upgrade process starts, go have a coffee, do your dishes, whatever, but: Leave the router and your computer alone! Wait until the router's reboot is completely finished.

If you have any more questions, just come back here and leave a comment - I'm happy to help.

you need to connect directly to the modem, then go to configuration page it should be stated in the modem manual. there you need to make the modem in bridge mode nothing else. apply settings and yur ready to blast off.