[Members] [news] Anyone can build a Windows Messenger client—with open standards access via XMPP

Peter Saint-Andre stpeter at stpeter.im
Wed Dec 21 15:40:18 UTC 2011

On 12/21/11 4:25 AM, Dave Cridland wrote:
> On Thu Dec 15 02:39:47 2011, jehan at zemarmot.net wrote:
>> I'll note that they indeed have DNS SRV records for both client and
>> server, though that gives back an alias (which — I think —is wrong,
>> though the RFC does not give this precise case. It says only one should
>> not return a target which is itself on alias; anyway we lose port,
>> priority, weight, etc. information):
> No, this is legal - any question may result in a CNAME answer, but you
> can't get an answer which refers to a CNAME. That is, looking up a
> record for the hostname returned by SRV cannot give you a CNAME,
> although asking for the SRV itself can do.
> However, in this case, following the CNAME doesn't give you anything
> useful, so this is equivalent to no SRV record at all, and clients will
> presumably fail to connect. The docs are quite clear that clients have
> to connect to a specific hostname and port.
> We can probably suggest to MSFT that they get the SRV records right;
> it's one less thing for client developers to need to do.

I'll pass this along to my contacts there.


Peter Saint-Andre

More information about the Members mailing list