XMPP Service Operators - 2024-06-13

I'm having issues connecting to jabber.org.

Is that just me?

From a quick check.... no.

From some (changing) locations in the O2 mobile Phone Network in Germany, my XMPP Clients are not connecting to my server. A few km in any direction, and all works fine again. Other Internetconnections like https or so work fine too. Has anybody similar experience? Anybody any idea where I should start loocking for debugging this problem?

Did you check your ipv6 connectivity, I got some issues cause some DNS entries was not setup correctly. The upload for mobile devices failed, cause wrong pointing DNS entries. Ipv4 not really common on mobile networks (correct me, if I am wrong)

Yeah, seems to be IPv6 related, can connect vie telnet to v4, but not v6. DNS looks correct, I investigate. Thanks!

you are welcome.

OK, that was to fast. I can not connect from my crappy homerouter via v6, when I connect from another server that is capable of speaking IPv6, I can connect without problems.

AAAA was set? If not and you have done it yet, DNS propagations takes a while.

dig AAAA example.com

nslookup -query=AAAA example.com

https://dnschecker.org/

AAAA was allright all the time.

if you like i can try from my o2 provider.

and i think we need some more infos - cause if all is setup (A and AAAA) it must be something different.

A client but is possible, if it prefers ipv6 and doesn't fallback to A if the AAAA record is there. And since ipv6 has bugs on that location /router it can make that behavior

good idea @menel

Maybe, I try to check that somehow. It happens on a location with the client on my phone, if I use the mobile connection one the phone and my mobile router, both O2. Two days I had this issue on work, any other place where I was worked fine. Yesterday i occoured on another location, and when I moved home, suddenly it worked. On the server side I see in this time nothing at all in the log files, so it seems, that the client is not reaching the server at all. ✏

And the router I tested here with buggy IPv6, is a router for checking here, not thr router that is giving me the problem.

It's unlikely to be related to the location. Based on my experience with clients in Italy or anywhere else, location shouldn't be a factor; it should work regardless. However, if you're experiencing a lack of mobile signal, that could be a contributing factor. I believe the issue lies with network problems. Have you checked the server logs?

Additionally, if you're at work and connecting through a firewall, that could also pose a problem. It might require a direct TLS connection on port 443. If I'm mistaken, please correct me.

jabber.org should be mostly back now. Need to work on that system upgrade 😩

MattJ: c2s is still failing for me

I think it is related to the network cell I am in. The signal is strong, I can whatch videos on YT without delay, just conversations is not connecting. If this happens, nothing to find at all in the server logs. But I definitly think it is a network problem before my XMPP server, and not a misconfiguration on the server side, but I keep digging.

You could see what happens if you create an srv record with high (soo... Low) priority, and let. That go to an ipv4 only address on your server

Jabber.org c2s works for me now.

👍

sven222, did you try a working server or instance - only for xchecking?

Good idea, both. Thanks. I dig in SRV records, and check if my test account is still working. Otherwise I click a new one.