Shiny app will not deploy (cannot publish) - SSL Certificate issue

When I try to deploy/publish my shiny app, even just a basic template, I receive the following error:

Error in function (type, msg, asError = TRUE) : **
** SSL certificate problem: self signed certificate in certificate chain

This appears to occur on multiple machines which all have the latest versions of R and RStudio installed on them. This only just stopped working this morning. I've been able to run shiny successfully and deploy without fail for several months until today. Any ideas? Thank you.

Do you have a firewall or a proxy between your computer and the Internet?

Yes! That was the issue! Thank you so much. Once I disconnected my firewall everything worked fine. So obvious. Thanks!

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