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I have a very strange case

We have a server with several IPs. For example: AA.AA.AA.AA; AA.AA.AA.AB; AA.AA.AA.AC; AA.AA.AA.AD; AA.AA.AA.AE; . . . And additional from another pool: SS.SS.SS.SS

Pages and this server display correctly from all ISPs except one. With this particular ISP we get time out for all IPs. On all devices on the network. Pings are back but the webpage do not open. With other service / ports (21,25,587,25,465) is also a problem.

Iptables are clean (even if this isp provides dynamic IP)

It looks like the connection was sitting on the firewall/blacklist.

Is there a way to verify who is guilty? Is it a server company or internet provider? Maybe the problem lies entirely elsewhere?

The server works with debian 8.8 + bind9 + apache2 + fail2ban (when it is disabled identically)

Please help and apologize for my english

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Run a traceroute to find out where the connection is being dropped

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  • In traceroute everything looks ok traceroute to website_on_server.com (IP_MY_SERVER), 30 hops max, 60 byte packets 1 192.168.0.1 (192.168.0.1) 6.904 ms 7.662 ms 7.658 ms 8 172.17.28.238 (172.17.28.238) 17.700 ms 17.676 ms 172.17.28.198 (172.17.28.198) 16.619 ms 9 * * * 10 91.121.131.24 (91.121.131.24) 17.696 ms 17.681 ms 17.670 ms 12 be100-1102.fra-1-a9.de.eu (213.251.128.113) 29.262 ms 29.141 ms * 14 * * * 15 * * * 16 * sXX.my_server.com (IP_MY_SERVER) 47.031 ms *
    – Roman Marchewka
    Jun 26, 2017 at 9:00

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