Does anyone have a dedicated server in OVHCloud Singapore?
I have a number of VPS and dedicated servers setup in the pool pool.ntp.org: Gombadi's pool servers I have a dedicated server with OVHCloud in Mumbai that is working fine with ipv4 & ipv6.
The new server in Singapore (sin-41.gombadi.com) is having “interesting” networking issues. I have been able to setup ipv6 without problems and that is in the pool pool.ntp.org: Statistics for 2402:1f00:8001:1a25::123 but when I try and add the ipv4 access I am quite often getting “network: i/o timeout”
Enter the DNS name (sin-41.gombadi.com) in the Add a server box on the Manage servers page. Most times, but NOT all, I get the network timeout but sometimes it displays the page showing the zones the server is going to be added to - Global, Asia, Singapore. So far when I press the “Yes that is my server, please add it” button I always get the timeout. If only it would get past that step then I could see which monitors were able to connect to it as that “may” help figure out the issue.
The problem is NOT that you can’t connect to the server at all but, my guess, that you can only connect if the server has sent you a packet. For example, server in Mumbai always getting timeouts to Singapore until Singapore sends a packet to Mumbai then Mumbai stops getting the timeout for a few hours. Sounds like a stateful firewall or similar to me.
So does anyone have any servers in OVHCloud Singapore and/or have you seen this issue on some other cloud/host. Interested to know where to go now.
Yes I have been talking to OVHCloud support to see if they know of any issues/Anti-DDos systems etc that may be causing the issue.
I don’t have a server at OVH, but for what it’s worth, my server makaki.miuku.net is at UpCloud’s Singapore DC. I can ping your server (ipv4+ipv6) and it seems to be less than 1 ms away. However, any NTP requests sent to your server over IPv4 go unresponded. NTP requests over IPv6 work fine.
I have a number of servers around the world and none of them seem to be able to get an NTP response from your server over IPv4.
Try running “tcpdump” on your server (tcpdump -nn -c 100 ip and udp and port 123) to see if the requests make it to your server. It may also be that only the responses get filtered out.
There is also a “NTP Check” option on manage.ntppool.org where you can enter your server’s IPv4 address to just check the server without adding it to the pool. Here’s one result:
sgsin1-3strqkc
Offset: 3.82021ms
RTT: 1.201464ms
ausyd1-2trgvm8
network: i/o timeout
defra1-3strqkc
network: i/o timeout
kricn1-3qerxkw
network: socket: address family not supported by protocol
Yes I tried tcpdump but nothing appears so it seems like something outside the server is blocking things. The NTP Check feature - I had forgotten about that but being behind the login to manage NTP servers I can’t point the hosting company to it and say - Keep fixing until you see a response from all testers.
Now just waiting on a response from the hosting company to see where we go next.
BTW - I am sending you an NTP packet about every 10 minutes so your system should be able to get a response from mine now. Just over 1ms away
After a bit of back and forward the answer was - Oh the ip address that was given to your server had a game firewall attached to it. Not something that I asked for and not something that was easy to find in their dashboard.