I currently maintain a connection to two PoPs (perhaps unfortunate that they are both run by the same ISP, so subject to the same maintenance windows). There have been times where both have been down. At one point this lasted for 2 or 3 days and I was about to set up a new tunnel when one came back to life, followed by the other one a few days later.

I'll give you the standard answer, which is the one that nobody seems to be able to accept for some strange reason. If you require an SLA (you are requesting that things are working for a certain X of time and that things are fixed in Y time) then you are basically in the wrong place. The ISPs that are generously providing the PoPs do this for free/gratuit(*), as such demanding that they fix things ASAP is simply not done. They are doing their bests and unfortunately in cases where hardware breaks things might take longer than you, and us for that matter, might want. Generally things get fixed quickly though so that most people don't even notice. In a few cases unfortunately it takes a bit longer. We can't do much about this and we just have to wait for the problem to be resolved. We try to update the ticket tracker with as much information as is available and what can be distributed. Just in case you are wondering, we (SixXS Staff) would love to have 100% uptime for everything, but unfortunately we really do not have the ability to move around the world, put new hardware in place and fix things in that way. We are doing everything from our home, next to our regular day job, which is sometimes something that some people seem to heavily forget... Additionally, you might want to look at that handy thing called The FAQ which also has an entry about this. If you cannot find yourself in the fact that you are using a free service that might sometimes have some downtime, simply because things sometimes just break, then as I mentioned above, you are in the wrong place. I suggest in that case that you call up some local ISPs and request service from them. Generally they will want some nice cash from you if you are requesting everything to be perfectly available, which is understandable. Also note that if you know of an ISP who does want to deploy IPv6, thus has a prefix and hardware available but no way to get it to their customers, don't hesitate to point them in our direction. Most part of the SixXS system is fully automated, thus that works fine. The only latent issues at the moment are users updates, which we will hopefully add to the UI soon so that those can be automated too. Oh, and a new aiccu client, but this requires some more work before it will be useful again in it's new incarnation. These don't stop anybody from using the services provided by SixXS though, they would just make it easier. Note that we of course always welcome positive comments and ideas, see the other forum topics about that. (* = demuc02 and dkcph02 might be one of the few exceptions as these are solely for their own customers)