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Keyne avatar Keyne commented on July 29, 2024

Same here with 2.4.3. Did you happen to solve it?

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comiconomenclaturist avatar comiconomenclaturist commented on July 29, 2024

No we are still having this issue. There are some messages in /var/log/kern.log like which may be related:

[Sat Apr 24 03:34:16 2021] TCP: request_sock_TCP: Possible SYN flooding on port 443. Sending cookies.  Check SNMP counters.
[Sat Apr 24 04:37:40 2021] TCP: request_sock_TCP: Possible SYN flooding on port 80. Sending cookies.  Check SNMP counters.
[Sat Apr 24 08:03:05 2021] TCP: request_sock_TCP: Possible SYN flooding on port 443. Sending cookies.  Check SNMP counters.
[Sun Apr 25 04:25:03 2021] TCP: request_sock_TCP: Possible SYN flooding on port 80. Sending cookies.  Check SNMP counters.
[Mon Apr 26 04:50:25 2021] TCP: request_sock_TCP: Possible SYN flooding on port 80. Sending cookies.  Check SNMP counters.
[Thu Apr 29 20:39:08 2021] TCP: request_sock_TCP: Possible SYN flooding on port 443. Sending cookies.  Check SNMP counters.
[Sat May  8 04:19:37 2021] TCP: request_sock_TCP: Possible SYN flooding on port 1044. Sending cookies.  Check SNMP counters.
[Mon May 10 14:04:15 2021] TCP: request_sock_TCP: Possible SYN flooding on port 80. Sending cookies.  Check SNMP counters.
[Wed May 12 02:44:33 2021] TCP: request_sock_TCP: Possible SYN flooding on port 443. Sending cookies.  Check SNMP counters.
[Thu Jun  3 12:40:34 2021] TCP: request_sock_TCP: Possible SYN flooding on port 443. Sending cookies.  Check SNMP counters.

Googling this issue shows lots of results for kernel tuning so I've set these values in /etc/sysctl.conf:

net.core.somaxconn=8192  
net.ipv4.tcp_max_syn_backlog=16384

but the issue still persists. Would love a fix for this!

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alainseys avatar alainseys commented on July 29, 2024

the only way i got it working by enabeling apache with proxy

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phschafft avatar phschafft commented on July 29, 2024

Does this still apply? Is there a ticket on the official ticket system at https://gitlab.xiph.org/xiph/icecast-server/-/issues ?

To me this sounds more like known problems in some specific versions of OpenSSL. Those should be fixed by updating.

If there is no report of this still applying I will close the ticket.

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phschafft avatar phschafft commented on July 29, 2024

As there is no reply, it seems it really was the OpenSSL bug. Therefore closing the ticket.

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