Nixos-rebuild unable to download .narinfo files from cache.nixos.org

Help
1

when running nixos-rebuild I keep getting these errors

error (ignored): unable to download ‘https://cache.nixos.org/7bn85d74qa0127p85rrswfyghxsqmcf7.narinfo’: Couldn’t connect to server (7)
error (ignored): unable to download ‘https://cache.nixos.org/rgf2n179gcv2lx3w6a0yq68yfd00bk66.narinfo’: Couldn’t connect to server (7)
error (ignored): unable to download ‘https://cache.nixos.org/5lrsc92ci8mk4bm2g08x00lqb5siw26j.narinfo’: Couldn’t connect to server (7)
error (ignored): unable to download ‘https://cache.nixos.org/3m0h7ik7l9x6yrf70r9izgww8nzg14ds.narinfo’: Couldn’t connect to server (7)
error (ignored): unable to download ‘https://cache.nixos.org/mwfrcd0sc8cdp7k1zrr3y1l3yhvrv20x.narinfo’: Couldn’t connect to server (7)
error (ignored): unable to download ‘https://cache.nixos.org/cv85w303q04gvzrd8l8pl83gihnbdyv6.narinfo’: Couldn’t connect to server (7)
error (ignored): unable to download ‘https://cache.nixos.org/8n9lk4ba3zgdscvfigvngs9wlwpdqj8q.narinfo’: Couldn’t connect to server (7)
error (ignored): unable to download ‘https://cache.nixos.org/dbw04mca700qg6dnkvrjhfz7wf37r74r.narinfo’: Couldn’t connect to server (7)
error (ignored): unable to download ‘https://cache.nixos.org/lnch3cjmri3hfk85civ9lwcnf817ksa8.narinfo’: Couldn’t connect to server (7)
error (ignored): unable to download ‘https://cache.nixos.org/wm6v1w92xhwrfzyr9p753lly6m7mwvhy.narinfo’: Couldn’t connect to server (7)
error (ignored): unable to download ‘https://cache.nixos.org/r6r8ghdk1wp4vz6xviib6zjjqb5mb8c3.narinfo’: Couldn’t connect to server (7)
error: unable to download ‘https://cache.nixos.org/zrgbhf59dk8yvc7rdsh2rc8i4nm2d525.narinfo’: Couldn’t connect to server (7)

when I open them by hand it works fine

2

doing the long way, ie nix-channel --upgrade nixos; nixos-rebuild switch worked for me after waiting a few minutes.

3

emm, i have a similar situation.
also couldn’t download the file when i rebuild the system
but the error reason is SSL connect error 35 and Timeout 28

seem the ways that we update the nix-channel will not help

4

My problems came down to bad configuration of my dns and systemd-resolved (the default network config gave me trouble), maybe you have a similar but unrelated problem?