Unfortunately restarting the device didn't work for me. Like you said, am able to connect through the browser just fine. Have connected via telnet many times in the past. Still getting the timeout:
$ telnet 192.168.18.237
Trying 192.168.18.237...
telnet: connect to address 192.168.18.237: Operation timed out
telnet: Unable to connect to remote host
Edit: forgot the port this time, doh. Working: `telnet {local ip} 8085`
We’re upgrading Roku Community to bring you a faster, more mobile-friendly experience. You may notice limited functionality or read-only access during this time. Read more here.
Planned Downtime:
Community will be unavailable for up to 24–48 hours during the upgrade window during the week of May 19th and you may notice reduced functionality.
In the meantime, for additional assistance, visit our Support Site.
We're sorry for this disruption — we’re excited to share what’s next!