Bitbucket git access unreliable via IPv6

[chirvasitua]

I access a repo hosted on Bitbucket from different locations, behind different public ip addresses. This morning (2026-02-28, around 11:00 EST) I noticed that all machines on my home network (behind the same public IP) were hanging at 
```

debug1: Connecting to bitbucket.org [2401:1d80:321c::bbc:1:df7c] port 22

``` 

but not consistently; intermittently and temporarily, so this is decidedly not a firewall issue or anything of the sort (also, these same machines had not misbehaved in this fashion literally hours before, with no intervening config changes of any kind).

No such hangs would occur at all on a machine zooming right through 

```

debug1: Connecting to bitbucket.org [104.192.142.24] port 22.

```

Running all git commands with GIT_SSH_COMMAND="ssh -4" resolves the matter *every time*, so v6 seems to be the cause (hence the title of the thread).

I am not asking for assistance (I do have a solution, as described), but rather announcing this for future reference in case other community members run across the issue.