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• Lots of 408 Request Timed Out from same IPs

  - by GreatFire

  Web server: Nginx. Checking our log files, there are many log entries of connections that: take 59-61 seconds send an empty request (or at least none is logged) result in a 408 response (request timed out) do not contain any http_user_agent originate from a limited number of IPs We are monitoring average times to serve responses and this obviously inflates our statistics. Apart from that though, is this a problem? Any idea why it is occurring? Does it suggest that somebody is intentionally messing with us? What should we do?

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• How to test a HTTPS URL with a given IP address

  - by GreatFire

  Let's say a website is load-balanced between several servers. I want to run a command to test whether it's working, such as curl DOMAIN.TLD. So, to isolate each IP address, I specify the IP manually. But many websites may be hosted on the server, so I still provide a host header, like this: curl IP_ADDRESS -H 'Host: DOMAIN.TLD'. In my understanding, these two commands create the exact same HTTP request. The only difference is that in the latter one I take out the DNS lookup part from cURL and do this manually (please correct me if I'm wrong). All well so far. But now I want to do the same for an HTTPS url. Again, I could test it like this curl https://DOMAIN.TLD. But I want to specify the IP manually, so I run curl https://IP_ADDRESS -H 'Host: DOMAIN.TLD'. Now I get a cURL error: curl: (51) SSL: certificate subject name 'DOMAIN.TLD' does not match target host name 'IP_ADDRESS'. I can of course get around this by telling cURL not to care about the certificate (the "-k" option) but it's not ideal. Is there a way to isolate the IP address being connected to from the host being certified by SSL?

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• How much does the geographical location of DNS servers matter?

  - by GreatFire

  We have started to run our own DNS servers located in Asia since that's where our main audience is. However, it seems that some users in the US are having difficulties accessing our website sometimes. I've noticed myself that DNS lookups of our domain from the US are relatively slow (500 msec+). Maybe the problems some users are having are due to other DNS configuration errors, but in general, how much of an issue is the geographical location of DNS servers? Should we have an additional server in the US?

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