Hi @andreas-unverdorben_1551 ,
What's happening here is your server is being overloaded due to lots and lots of traffic -- effectively you are doing a Denial of Service attack on you server. As I mentioned in npm install slow on proxy feed, ProGet is not a static file server and there is a lot of processing required for each request.
The best way to handle this is to run a load-balanced ProGet server cluster.
Alternatively, you will need to reduce or throttle traffic.
- ProGet has a built-in traffic throttle under Advanced Settings (concurrent web request limit)
- Stop using the NuGet v2 API, that's very inefficient
- Stop or reduce connector usage, so ProGet doesn't have to contact nuget.org etc.
- Do not use multiple sources in your nuget configuration, since NuGet will issue all of those requests simultaneously
- Disable parallel restore on NuGet and npm
See How to Prevent Server Overload in ProGet to learn more.
Best,
Steve

Feb 25)