A Vanguard 6455 router has two ETH ports with it's own IPs. While connecting to the first the device shows a banner with "Product Type: Vanguard 300" and "Vanguard 6455" while connecting to the second. It was found that at one device two different cofgurations are installed. The second one works properly and the "Vanguard 300 configuration" is set up un wrongly and it is not active. Moreover a manager's password for this configuration was lost. How can the wrong configuration be deleted without hard-reset? Or is there any default managers password for the Vanguard?
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Connect the IPS modem to yellow port. Then connect PC to any other port. Test if internet is available on PC. Installing Belkin Software will also show if DHCP devices show up. The default IP should be 192.168.2.1 then new devices will similar IPs. Plus check if your other wireless devices has WPS. It is a self discovery option.
Double check the IP Address info for both printers - ensuring the IP Address, Subnet Mask and Default Gateway are configured correctly. Printers should never use DHCP - so this info should be configured as a static IP.
Also, try moving the connections for the printers to different ports on the router. It is possible that the router may be going bad and the printer ports are the first to show the signs.
One final tip - power cycle the router. I have used D-Link for over 8 years and have had to power cycle their routers and hubs occasionally as they sometimes lock up. This typically affects all ports - so this is probably not the cause of your issue but power cycling the device may help resolve the issue.
You may have been hit by lightning or power surge which knocked out one or 2 ports. If the WAN port is out you may still be able to use your router as a hub provided your modem can be configured as a router (many newer ones can) . Connect one of your working LAN ports to the modem and others to your computers.
in my experience, any router where you cannot access it, you will have to do a factory reset. Generally there is the small paperclip size button in the back that you press and hold for 10 seconds while the router is on. after that, you release and unplug the router. Press the small button, plug in the router, and hold it for about 20 seconds. Sadly, I have found this my most common and best answer...