Differences

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--- litespeed_wiki:config:enable_quic [2019/03/26 18:14]
Jackson Zhang [LF_SPI needs to be turned off when CSF used]
+++ litespeed_wiki:config:enable_quic [2020/12/14 04:02]
Eric Leu [Test Outgoing]
@@ Line 27: / Line 27: @@
 If there is no extra firewall such as CSF, UDP 443 should be enabled by default. If CSF is used, you need to enable it at the CSF level.
+ConfigServer Security & Firewall -> csf - ConfigServer Firewall -> Firewall Configuration -> IPv4 Port Settings -> UDP_IN and UDP_OUT should enable ''443''.
 {{ :litespeed_wiki:config:udp-443-csf-quic.png?400 |}}
-Also make sure that ''UDPFLOOD'' is set to 0.
+Also make sure that ''UDPFLOOD'' is set to Off ''0''.
 ==== Plesk ====
 If a firewall is activated, you need to enable UDP 443 manually.
@@ Line 62: / Line 66: @@
   Ncat: Version 6.40 ( http://nmap.org/ncat )
   Ncat: Connected to 74.125.24.104:443.
+==== Verify with TCPDUMP ====
+Sometimes that "nc -vu" command is not enough to verify UDP 443 port unless it will return some information back
+You can verify it with tcpdump, e.g.
+Run tcpdump on the website's server.
+  tcpdump -vv udp port 443 -X
+Run nc command from any client server.
+  nc -vu YOUR_DOMAIN 443
+and you should see some output on server if there's any UDP port 443 traffic in and out.