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Fixing Addon-Sign Problem With The Description - JWT iat (issued at time) is invalid. Make sure your system clock is synchronized with something like TLSdate.

Windows users needs to sync the time.

Right click the clock on your start-menu toolbar, and select Adjust data/time,
Go to the last-tab - Internet Time, and click Change settings... button,
Check ON the little-checkbox and click the Update now button.




If you have firewall (or PeerBlock) blocking either one of those servers, unblock them:

time.windows.com
time.nist.gov
time-nw.nist.gov
time-a.nist.gov
time-b.nist.gov

alternatively add (just copy&paste it) ntp.ubuntu.com.

Run services.msc (from Start-Run) and see if the service W32Time (a.k.a Windows Time) is set to either Automatic or Manual - but NOT Disabled,

Try again, adding ntp.ubuntu.com seems to fix the problem for me.

You might want to use a longer timeout value (6 minutes should work fine..).

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