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If you are having trouble connecting to the router's web interface through the default IP address 192.168.1.1, please Ensure that your computer or device is properly connected to the router via Ethernet cable or Wi-Fi. You can try resetting your device's network settings and the router itself to see if this resolves the issue.
Double-check that you are using the correct IP address for the router. The default IP address for the RUT955 is 192.168.1.1, but this can be changed by the user. If you're not sure use ipconfig to check your computer network settings.
Clear cache and cookies, to eliminate any stored information that may be interfering with the connection to the router's web interface.
Factory reset: If all else fails, you can perform a factory reset on the router. This will erase all settings and configurations, restoring the router to its default state.