CSF Can ping but can't open page

TCP Recycle Fix

Updated both Centmin Mod 123.08stable and 123.09beta01 builds for a TCP fix to disable tcp_tw_recycle which causes problems when multiple local lan devices try to connect to the server from same ISP IP. Problem was reported by @pamamolf at CSF - Can ping but can't open page | Page 4 | Centmin Mod Community Thanks for the bug report and making Centmin Mod that one step better

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To apply the fix, update your local server's Centmin Mod branch code using below listed instructions for centmin.sh menu option 23 submenu option 2. Then re-run centmin.sh once to auto apply the fix. This fix and issue only applies to non-OpenVZ systems. OpenVZ VPS servers are not able to edit TCP settings so Centmin Mod never applies any in the first place.

Commit: Beta Branch - disable tcp_tw_recycle | Centmin Mod Community

To update your Centmin Mod builds follow instructions at centminmod.com/upgrade.html and respective version threads below:

• Centmin Mod 1.2.3-eva2000.08 stable install & update thread
• Centmin Mod 123.09beta thread
• Example of centmin.sh menu option 23 git updating code.
• How to upgrade Centmin Mod + backing up customisations

 

try and see if it helps your friend first

seem it's applying to /etc/sysctl.conf so you have /etc/sysctl.conf set too .. older centmin mod used /etc/sysctl.conf even for centos 7 so can empty out /etc/sysctl.conf if you have /etc/sysctl.d/101-sysctl.conf

 

a few bugs with the latest update fix have been fixed again so should be good this time including detection for centos 7 and /etc/sysctl.conf

disabled it too

 

that could be FAQ item 40 related

 

Is this ftp into same site using same pure-ftpd login details ? via same server IP ? with same user ISP IP addresses or different ISP ip addresses ?

 

when you get back and have time, try going through the steps we went through at Pure ftp disconnect issue | Centmin Mod Community with pure-ftpd logs, verbose logging and lfd.log etc.

also post output for this command

Code (Text):

grep -C3 MaxClients /etc/pure-ftpd/pure-ftpd.conf

i.e. output

Code (Text):

grep -C3 MaxClients /etc/pure-ftpd/pure-ftpd.conf
# Maximum number of simultaneous users
MaxClientsNumber            500
--
# Maximum number of sim clients with the same IP address
MaxClientsPerIP             200

 

also post output for this command

Code (Text):

grep -C3 MaxClients /etc/pure-ftpd/pure-ftpd.conf

i.e. output

Code (Text):

grep -C3 MaxClients /etc/pure-ftpd/pure-ftpd.conf
# Maximum number of simultaneous users
MaxClientsNumber            500
--
# Maximum number of sim clients with the same IP address
MaxClientsPerIP             200

it could be due to how your users FTP clients connect/transmit data i.e. opening too many simultaneous connections/transfer sessions at one time i.e. Filezilla's settings for simultaneous transfers and concurrent download/uploads don't set too high



you can count them when your users are all logged into FTP doing download/uploads, via ssh command

Code (Text):

netstat -plantu | grep YOURISP_IPADDRESS | wc -l

 

then you should go through all the troubleshooting in this thread for them too. Is this same group of user who had problems or different group ? and different server ? Make sure the fixed TCP setting is in place on this different server too

 

also which ftp clients apps they using ? have you tried different ones ? wincp, filezilla, cuteftp, cyberduck ?