I have only access to the hosted site through Plesk, so limited information. Nothing is showing in the IIS logs. The site was back up again this evening, but when I tried to install the NopCommerce Australia Post plugin, it crashed again. The only log entry is the last entry, with an error code of 500 and GET /Admin/Plugin/List - HTTP/1.1
Looking at the ASP.NET configuration of the server, I see it is running Framework 4.8.3761 - could this cause problems with Nop v4.00?
All these problems started when I tried to install the Australia Post API plugin from Paul at BricksnWeb. Up until then, the site had been stable, but as soon as I tried to refresh the plugin list after copying his plugin to the plugins folder, the site crashed, and has been giving trouble ever since. I have been talking to him, but no solution.