Sandbox: upstream connect error or disconnect/reset before headers. reset reason: connection termina

[arzterant]

I can't use the authorization code grant OAuth method, the authorization URL always throws an error on the sandbox environment. Any ideas if there's a general bug? It doesn't even work from https://developer.ebay.com/my/auth?env=sandbox&index=0 when clicking the "Test Sign-In" button...

Always getting the following error:

upstream connect error or disconnect/reset before headers. reset reason: connection termination

[shipscript]

If eBay's own tool also encounters an error, there may be a transient system error. Wait and try later.  If it persists, your own system may be the source. If using a VPN, try a direct connection instead.

[arzterant]

We've been waiting 12 hours now... tried with different browsers, from different locations and IP addresses. Nothing's working. I'm pretty sure it is an issue with Ebay because it even happens when using the built-in test tool.

[shipscript]

Another report of this sandbox error has also appeared. So likely an eBay issue.