This again appears to be broken, for both security.ubuntu.com and us.archive.ubuntu.com, at least.
Exactly as Jens had noted above - this is (also) an issue with AAAA records being provided, but not accessible. Though security.ubuntu.com appears to be in ever-so-slightly better shape than security.ubuntu.com.
Some current DNS lookups as of this writing:
security.ubuntu.com has AAAA address 2001:67c:1360:8c01::18
security.ubuntu.com has AAAA address 2001:67c:1562::17
security.ubuntu.com has AAAA address 2001:67c:1562::13
security.ubuntu.com has AAAA address 2001:67c:1562::15
security.ubuntu.com has AAAA address 2001:67c:1360:8c01::19
security.ubuntu.com has AAAA address 2001:67c:1562::16
security.ubuntu.com has AAAA address 2001:67c:1562::14
us.archive.ubuntu.com has AAAA address 2001:67c:1562::14
us.archive.ubuntu.com has AAAA address 2001:67c:1562::16
us.archive.ubuntu.com has AAAA address 2001:67c:1562::13
us.archive.ubuntu.com has AAAA address 2001:67c:1562::17
us.archive.ubuntu.com has AAAA address 2001:67c:1562::15
None of the 2001:67c:1562:: addresses are responding by IPv6, either over ping or HTTP. The two 2001:67c:1360:8c01:: addresses for security.ubuntu.com are properly responding, however.
This again appears to be broken, for both security.ubuntu.com and us.archive. ubuntu. com, at least.
Exactly as Jens had noted above - this is (also) an issue with AAAA records being provided, but not accessible. Though security.ubuntu.com appears to be in ever-so-slightly better shape than security. ubuntu. com.
Some current DNS lookups as of this writing:
security.ubuntu.com has AAAA address 2001:67c: 1360:8c01: :18 1360:8c01: :19
security.ubuntu.com has AAAA address 2001:67c:1562::17
security.ubuntu.com has AAAA address 2001:67c:1562::13
security.ubuntu.com has AAAA address 2001:67c:1562::15
security.ubuntu.com has AAAA address 2001:67c:
security.ubuntu.com has AAAA address 2001:67c:1562::16
security.ubuntu.com has AAAA address 2001:67c:1562::14
us.archive. ubuntu. com has AAAA address 2001:67c:1562::14 ubuntu. com has AAAA address 2001:67c:1562::16 ubuntu. com has AAAA address 2001:67c:1562::13 ubuntu. com has AAAA address 2001:67c:1562::17 ubuntu. com has AAAA address 2001:67c:1562::15
us.archive.
us.archive.
us.archive.
us.archive.
None of the 2001:67c:1562:: addresses are responding by IPv6, either over ping or HTTP. The two 2001:67c: 1360:8c01: : addresses for security.ubuntu.com are properly responding, however.
Please investigate and resolve. Thanks!