I asked admin of my instance few minutes ago and didn’t get reply yet, but it seems your instance(mastodon.sdf.org) blocks pone.social.
EDIT: my instance isn’t blocking mastodon.sdf.org
I asked admin of my instance few minutes ago and didn’t get reply yet, but it seems your instance(mastodon.sdf.org) blocks pone.social.
EDIT: my instance isn’t blocking mastodon.sdf.org
From my understanding some problem with federation happened and because of that SDF upgraded the instance
There was no outgoing federation happening