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

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 ?