Cannot change net.ipv4.tcp_keepalive_time

[JacobR9]

Hi,

I have Parallels Plesk Panel version 10.4.4 (centos-5-x86_64) and I would like to change the value of tcp_keepalive_time.
I tried to edit the sysctl.conf file using root:

sudo vi /etc/sysctl.conf

then added

net.ipv4.tcp_keepalive_time = 1800

then executed

sysctl -p

but I got the following error message:

error: permission denied on key 'net.ipv4.tcp_keepalive_time'

I also tried the following command with the same error message

 sudo sysctl -w net.ipv4.tcp_keepalive_time=1800

Any help?

Thanks

 

[IgorG]

How it is related to Plesk?
Is it VPS or real server? Do you have SELinux enabled?

 

[JacobR9]

I wasn't sure if Plesk has some restrictions on sysctl.conf or not.
This is VPS, and SELinux is disabled.

 

[IgorG]

You can't use sysctl options inside VPS because you haven't access to kernel from VPS. You should do it directly on hardware node.