Too Many Sockets or Files Open

Only on Linux systems: if too many sockets or files are open by the process this can cause problems.

How to detect

Check the file descriptor limit:

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Check the used file descriptor count on a running process:

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If the count is close to the limit this will cause problems.

Rule of thumb: 1 scan workflow requires 2-3 file descriptors.

Solution

Increasing the number of file descriptors

The command ulimit -n displays the current set number of maximum file descriptors. In order to increase this number follow the next steps:

Append this line to /etc/sysctl.conf

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Add the following lines to /etc/security/limits.conf

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Restart the system to apply the new configuration. After restart you can check the changed limit by issuing ulimit -n

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Too Many Sockets or Files OpenHow to detectSolution