IpDiscover doesn't work in Linux OCS Agent

Hi people, I have OCS Inventory Server 2.5 and one Linux OCS Agent 2.4.2 in a Debian 9 box.

This Linux agent send the inventory OK, but it doesn't execute the IpDiscover in ots own network. Some relevant lines of the ocsinventory-agent.log are these:

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Linux::Distro::NonLSB::Debian disabled because of a 'runMeIfTheseChecksFailed' in 'Ocsinventory::Agent::Backend::OS::Linux::Distro::NonLSB'

Thu Dec 20 10:03:14 2018][debug] [download] Writing config file.

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::IpDiscover::IpDiscover ignored

[Thu Dec 20 10:03:14 2018][debug]  - nmap found

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::IpDiscover::Nmap ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::AIX ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::BSD ignored

[Thu Dec 20 10:03:14 2018][debug]  - dmidecode found

[Thu Dec 20 10:03:14 2018][debug]  - dmidecode found

[Thu Dec 20 10:03:14 2018][debug]  - Sys::Hostname loaded

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Generic::Ipmi ignored

[Thu Dec 20 10:03:14 2018][debug]  - lspci found

[Thu Dec 20 10:03:14 2018][debug]  - lspci found

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Generic::Lsusb ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Generic::Packaging::BSDpkg ignored

[Thu Dec 20 10:03:14 2018][debug]  - dpkg found

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Generic::Packaging::Gentoo ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Generic::Packaging::Pacman ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Generic::Packaging::RPM ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Generic::Printers::Cups ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Generic::Repository::BSD ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Generic::Repository::CentOS ignored

[Thu Dec 20 10:03:14 2018][debug]  - apt-cache found

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Generic::Repository::Rhel ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::HPUX ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Linux::Archs::ARM ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Linux::Archs::Alpha ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Linux::Archs::MIPS ignored

[Thu Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Linux::Archs::PowerPC ignored[Thu
Dec 20 10:03:14 2018][debug] Ocsinventory::Agent::Backend::OS::Linux::Archs::SPARC ignored

What can be the problem???

Thanking in advance.