sum.golang.org: repeated Failed to connect to github.com port 443: Connection refused caching

[mooreatv]

There seems to be some connectivity issue with sum.golang.org:

https://sum.golang.org/lookup/fortio.org/progressbar@v0.1.0 (and 0.1.1)

not found: fortio.org/progressbar@v0.1.1: invalid version: git ls-remote -q origin in /tmp/gopath/pkg/mod/cache/vcs/b9cd86b48fce1d705077645c1732dfb008bc75c92892a5efd99cbee5bdea8d7f: exit status 128:
* Connection #0 to host sum.golang.org left intact
        fatal: unable to access 'https://github.com/fortio/progressbar/': Failed to connect to github.com port 443: Connection refused

The tag does exist https://github.com/fortio/progressbar/releases/tag/v0.1.1

This is from go get - already tagged 2 to try to get past that

[mooreatv]

looks like a duplicate of #72121