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Solved
WNDR4000 - Blocking Admin Access After Latest Security Update
I updated the firmware in response to a notice I received from Netgear about a security fix. Now, every time I adjust the various settings and the router reboots it blocks my access to the admin pag...
I just applied the latest Firmware (1.0.2.6) update as well, I don't recall the previous version, but it was a much earlier version 1.0.0 (not sure of the last digits). After the update and installation completed (which was applied by direct ethernet connection, i.e. not WIFI), I can no longer connect to the web Administration Page via the default gateway IP address. What's odd is all my setups remained in tact after the Firmware update was applied, including the authentication credentials. If I run an IPCONFIG, the settings for DHCP, Gateway, etc are all as was on my directly connected laptop. But, when I first re-open the admin page using the default gateway IP address and authenticating I receive the message "You are currently logged in from another device. There can be only one device logged in at a time. If you log in from this device, the other device will be logged out. Do you want to proceed?", as I was in the same, or original browser session when the firmware update was applied I clicked "yes" to proceed, after which the connection fails to open the adminstration page. I tried different browsers (Chrome, IE), still no access.
I powered down the router, restarted, entered gateway IP address to connect to admin page, authenticated as requested and the same warning message appears ... "You are currently logged in from another device. There can be only one device logged in at a time. If you log in from this device, the other device will be logged out. Do you want to proceed?" But, this time, choose "No" and the response page displayed a conflicting dynamic IP address, which is different from the dynmamic IP address assigned to the laptop. which I applied the firmware upgrade from. On a whim, I turned off my WIFI connection on my cell phone. I tried to ping the new, conflicting IP address assigned and the request timed out. I then tried to connect to the administration page using the default gateway IP address, SUCCESS.
Bottom line, check what other device may be connected, which I was able to determine by choosing "No" to the Do you want to proceed?
(Sorry for the late response)
Here is what seems to be happening:
After updating the firmware, the TCP/IP address of the admistrative device that was used to log into the router is somehow being permanently cached. So... when you change the SSID/security/admin password/etc immediately after the upgrade, the box will reboot itself. When that happens, you MUST have the same IP address in order to log back in - rebooting the router again does not clear that cached IP address. The prior solution of clicking "No" on the popup window to find out what IP address to use applies - make sure you use that adress.
Now, once you have logged in AND out (I think) that protective mechanism works "properly" - it still caches the previous IP adress with no apparent timeout, but powering down the router will clear that cache.
I think this is still a little wonky (I am also experiencing some lag/buffering) but at least I can administer the router (still may be time for a replacement).