Comment 3 for bug 1953627

if I read this correctly:

> There is another issue, which is triggered, when re-using a connection after a ldap.SERVER_DOWN connection. Then the reconnection does not apply as well[..]

https://github.com/python-ldap/python-ldap/pull/267#issuecomment-520436367

a workaround for keystone might be, to use a new connection and not reuse an existing connection, when encountering ldap.SERVER_DOWN.

I don't know if it is feasible though, as I'm not familiar with the keystone codebase.