SharePoint failure after web part update

After putting a new web part in production on our SharePoint 2010 site and running Update-SPSolution to put the new code in place, we got the following errors:

IIS7 Application Pool is unavailable. The IIS 7 Application Pool named . . . is unavailable as the Application Pool has been stopped.

Web Site binding is already in use. The World Wide Web Publishing Service (WWW Service) did not register the URL prefix http://*:80/ for site 1. The necessary network binding may already be in use. The site has been disabled. The data field contains the error number.

The SharePoint site simply displayed a Service Unavailable message.

Rebooting the web and application servers had no effect.

In Sites, the Default Web Site was Stopped, but when I attempted to start it, I got the Web Site binding is already in use error message.

To fix it, I clicked on Application Pools. Two of the Application pools (one for our company intranet site and SharePoint Web Services Root) were stopped. I manually started them, and the intranet came back up.

SharePoint failure after web part update

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