My Comcast business modem had dropped all 4 channels and I didn’t have physical access to the device (it was behind a closed/locked door). Never fear, I fired up Safari, pointed it to 10.1.10.1 and punched in the following credentials:

mso
D0nt4g3tme

I then went to the Administrative tools section which includes the ability to restart the modem. It worked!

**************UPDATE***************
I restarted the modem at work recently and as I watched the modem’s logs, I saw Comcast download a new config file to the modem that effectively wiped the authentication credentials published above. When I find new ones, I’ll update this blog.
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