Not getting reply from Freelancer

[#1]

I sent a message about 90 minutes ago to my freelancer. I have not received a reply yet. Is upwork platform down?

[#2]

Sometimes communication through Upwork IS unreliable.

That does not mean that is happening now. 90 minutes ago? Maybe the freelancer is watching a movie. Or sleeping.

My recommendation is to stop relying on Upwork for communication with freelancers you have hired. Use more reliable methods such as email, text message, Slack, etc.

[#3]

Looks like it was a temporary server issue or technical glitch. Just now received reply. And the system shows the "Status" too.

[#4]

For future keep eye at this page

https://status.upwork.com/

active issues shown there.