Q. Whenever I run netstat command it bumps be back with an error, which read as follows:
tcp 0 0 ip-201-19-xxx-xxx.ip.s:http adsl-71-129-54-230.dsl:2249 TIME_WAIT
tcp 0 0 ip-201-19-xxx-xxx.ip.s:http ca-dstreet-cuda3-c6a-5:4380 TIME_WAIT
tcp 0 0 ip-201-19-xxx-xxx.ip.s:http ip72-199-249-17.sd.sd.:1845 TIME_WAIT
tcp 0 0 ip-201-19-xxx-xxx.ip.s:http cache-mtc-ad10.proxy.:59985 TIME_WAIT
warning, got duplicate tcp line
warning, got duplicate tcp line
Although, everything is working fine but I am little worried about this error. How do I fix this error and what does it mean?
A. This is quite uncommon. This error indicating that client/server connection are rapidly closing and reconnecting to ip ip-201-19-xxx-xxx.ip on same port 80.
To fix this problem, open /etc/sysctl.conf and
# vi /etc/sysctl.conf
Append or modify text as follows:
net.ipv4.tcp_tw_reuse = 0
net.ipv4.tcp_tw_recycle = 0
Save the file and reboot the system. If particular client IP addresses causing this problem, use the iptables to drop the client IP or block IP with null routes.
- RSS feed or Weekly email newsletter
- Share to Twitter • Facebook • 3 comments... add one ↓
Linux Network IP Accounting
CentOS / Redhat Iptables Firewall Configuration Tutorial
How to configure pfSense as multi wan (DUAL WAN) load balance failover router
Iptables Drop IP Address
Linux Iptables Setup Firewall For a Web Server
How To Listen Pandora In Europe Outside USA Using Proxy
How to add comments to iptables rules on Linux
| Category | List of Unix and Linux commands |
|---|---|
| File Management | cat |
| Firewall | CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
| Network Utilities | dig • host • ip • nmap |
| OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
| Package Manager | apk • apt |
| Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
| Searching | grep • whereis • which |
| User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
| WireGuard VPN | CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |
# Append or modify text as follows:
# net.ipv4.tcp_tw_reuse = 0
# net.ipv4.tcp_tw_recycle = 0
I did like you said, but “warning, got duplicate tcp line” still happens. What does it mean actually. Where I can find more info about the matter?
Nope.. This does not work…
How do you remove user with smbpasswd command, I have been searching not able to find it any help/advice would be great.