In my case krb5kdc ist running out of leck mich, cause the host system hasn't realy enough system resources.

The correct thing to do is adjust net.ipv4.tcp_max_syn_backlog to a high enough value that it no longer fires this warning.

You will probably also want to adjust the TCP stack in general to have more memory.

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An overview of the SSSD architecture
The SSSD consists of several processes, each of them has its own function. The SSSD processes can be one of the following:

1. the monitor - The purpose of the monitor process is to spawn the other processes, periodically ping them if to check if they are still running and respawn them if not. There...

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Sometimes you'll need to setup a single point of authentification for e.g. to centralize stuff. 

I've found a nice Document, about Integrating Linux systems with Active Directory using Open Source Tools from 2017.

https://www.heinlein-support.de/sites/default/files/slac2017_Integrating-Linux-Systems-With-Active-Directory-Using-OpenSou...

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