Haven't had a need to log into the ISY for several month but noticed a program not initiating. Tried to log in and get the "Failed. Retry authenticating ISY" Tried to log into the portal and it will not let me log in either. Solid blue light, everything looks normal. Did a power cycle on the ISY and the PLM, tried again, still can not log in. Had a complete power outage last week that lasted over an hour. The ISY is plugged into a UPS battery back-up so it SHOULD have maintained power but can't confirm, not home at the time of the outage. Not sure why it's not accepting password, nothing has changed and I KNOW I have the correct password. Is doing a full reset the only option?

It's remotely possible that the SD card is damaged. Also check your ethernet cable and try rebooting your router.

Are you trying to access the ISY from the admin console?

Yes, Admin Console.

House is hard wired and multiple switches. Only router is the Comcast gateway for internet access. Everything going through the master switch is working fine. ISY is rejecting user/password. The timed functions are all working as intended except one group of landscaping lights that don't come on. In the past when this happened I discovered module was reverting to power on= 0%. Reset to 100% and back to working. Assumed somehow it reset to 0% again and that's what I was trying to log in and change.

Maybe the password got reset somehow?  Try admin/admin

Also try removing power from the isy, wait about 15 seconds, then power up