@Zanna (pinging only mods since only they can edit duplicates list here because of tags used) The issue mentioned in
this question can be because of archive server going down as we saw couple of days ago. The target's answer doesn't address this thing. So, IMO the dupe list must
this dupe target. Moreover, there was no evidence that OP was using some proxy or had issues with IPv6 (cc @jokerdino @Ravexina)