@tivervac asked in eclipse/openvsx#845:
I'm trying to publish my extension via the web interface (PUBLISH EXTENSION here).
This worked fine in the past, but now I get the error message shown below. The .vsix is 272.74MB large.

I'm moving the question to this repo, because the openvsx server upload limit is 512 MB.
I think it is a proxy server that rejects the upload.