Recently our company proxy was changed. We can no longer add/update nodes in the palette with "Manage Palette". Which url's do we need to whitelist in the proxy to make it work?
Do you get the list of nodes appear in the install tab? Or does it fail when you click install on a particular node?
If the former, the url it tries to load is https://catalogue.nodered.org/catalogue.json
If the latter, then it needs to allow access to the npm repositories. I presume it'll be https://registry.npmjs.org but there may be other subdomains of npmjs.org used - I'm sure a google search will help. The alternative is to tell the npm command-line to use your proxy - https://jjasonclark.com/how-to-setup-node-behind-web-proxy/
The catalog works, but the node installation fails.
