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Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

January 10, 2019 11:19PM
The domain is proxied over cloudflare and the access log shows a large number of requests to the website from the cloudflare servers

121115 162.158.88.4
121472 162.158.89.99
121697 162.158.90.176
122265 162.158.91.97
122969 162.158.93.113
125020 162.158.91.103
126132 162.158.90.194
128913 162.158.91.25
128980 162.158.93.89

the requests were all GET / and the rate at which it is done mostly is extremely high pointing to a Layer 7 attack

We cant block the cloudflare IP's on the server as other sites (its a shared hosting server) may be using Cloudflare . At the moment the target IP on the server is blocked at the network level.Luckily the domain was using a dedicated IP

As I already said, Apache handles this pretty well , the only small issue I see is the server load getting a bit above normal and the Apache scoreboard getting filled up, but with Nginx the entire webstack freeze with the CLOSE_WAIT state and ESTABLISHED state extremely high and we can bring back things to normal only after disabling Nginx . Once Nginx is disabled, the CLOSE_WAIT and ESTABLISHED states clear off immediately too
Subject Author Posted

Nginx hang and do not respond with large number of network connection in FIN_WAIT state

Anoop Alias January 09, 2019 09:58PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

Peter Booth via nginx January 10, 2019 01:04AM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

Maxim Dounin January 10, 2019 08:46AM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

Anoop Alias January 10, 2019 01:06PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

Anoop Alias January 10, 2019 01:26PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

Peter Booth via nginx January 10, 2019 04:34PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

gnusys January 10, 2019 02:47PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

itpp2012 January 10, 2019 04:29PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

gnusys January 10, 2019 10:30PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

gnusys January 10, 2019 11:02PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

Peter Booth via nginx January 10, 2019 11:08PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

gnusys January 10, 2019 11:19PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

Peter Booth via nginx January 10, 2019 11:36PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

gnusys January 10, 2019 11:32PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

Peter Booth via nginx January 10, 2019 11:42PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

gnusys January 10, 2019 11:56PM

Re: Nginx hang and do not respond with large number of network connection in FIN_WAIT state

gnusys January 11, 2019 10:30PM



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