Before I throw this router in the trash, maybe someone can help. My need is simple: set the router to a static IP. On the setup screen, on the drop-down menu for Internet Connection Type, the current setting is "Automatic Configuration - DHCP". When I select "Static IP" I get logged out and the login screen appears with the message, "Session Failure / Please login again". I've tried this numerous times.

What am I doing wrong?

According to the manual that should work. I assume you are plugged into a LAN port?

Is this a public-facing router? If so, you might want to check the ISP's terms of service; they might preclude a static IP.

Yes, we have 5 static IPs and 3 have been in use for years.

I'm still struggling with this "simple" router. I believe I've set the static IP, and before doing that I set the router's LAN facing IP to 192.168.0.1, rebooted, then successfully connected to the router on that IP. I then set the static IP and netmask, but when I try to save settings I get the message "192.168.0.1 Invalid value". See image. Why? As stated, prior to attempting to set the static IP I did set the LAN IP to 192.168.0.1, rebooted the router and connected to the router on that IP. What's invalid about it?

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I don't know. Basically all the instructions indicate is to select static IP and complete the fields required by your ISP and any optional fields if necessary. I assume that you probably need to do this disconnected from the MODEM. Without seeing what is behind the error message we can not tell if there is an error.

There is nothing behind the error message. I positioned the error box before taking the pic. Behind the error message is "Host Name"(blank), "Domain Name" (blank), and "MTU" (auto). I don't know, I've worked on SonicWalls that weren't this irritating to set up. I'll see if there is a firmware update.

I would suggest that the "192.168.0.1" in the error box is a red-herring, it's showing the IP address of the router as the web source of the error message rather than the cause of the error message.

I would also suggest that the "Invalid Value" is the fact you've not specified a default outbound gateway or default DNS servers for your WAN side.

I think you're right about the "red herring" idea. Still I had trouble. I went to a different setup page changed something innocuous and was able to save from that page. I went back in and set gateway and DNSes in the Static IP section and those took, finally.

After restarting the modem, changing /etc/resolv.conf to have the same nameservers and restarting eth0 on the host, it kept changing my /etc/resolv.conf to have "nameserver 192.168.1.1", which is neither the router IP nor the nameservers I set it to. This kept happening after changing resolv.conf and restarting eth0, even after I set eth0 to USE_DHCP="no" and DHCP_KEEPRESOLV[0]="yes". Finally, I rebooted the host and the nameservers were now preserved correctly in resolv.conf. I'm guessing that before the reboot dhcpd or the like was running and kept clobbering things when I restarted eth0. On reboot that didn't run dhcpd, so perhaps that was the culprit. Not sure because I didn't verify that dhcpd was running before I rebooted. In any case, it's appears to be working now. I'm embarrassed that it was such a struggle with this normally simple device!