I try to install EndeavourOS on a Raspberry Pi 4, with only an ssh connection. But when I try to connect to the ssh server, I get no connection. When I control with nmap for an open port, port 22 is closed. What can I do about this?
Thank you 
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I haven’t try EOS on any of my pi, raspbian let’s you edit a config file directly on the sd card. Did you look if you can do this ? If you can’t you need to connect your pi to a monitor/keyboard.
For starting the ssh daemon each time your pi boot:
sudo systemctl enable sshd.service
And if you want to try before setting it in your headless spot:
sudo systemctl start sshd.service
Just a thought - what advantage is there to install EndeavourOS ARM to RPI compared to ArchARM when the device will be only a headless server.
I thought that the advantage of EnOS is just GUI installer but everything else is basicaly Arch. 
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@pudge do great job set it up for usr on EOS , if usr just use ArchARM usr need set up all them self . Pick your poison 
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Also did arch can have control on the gpio ? I know it was missing on “raspbian” 64bits version.
Yes, he did great job 
but still it is set up with an intention to run full graphical desktop environment. For headless I would expect significantly less. 
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the choice is there for full graphical desktop ( if usr want ) we all have different need/idea on server use . he make it easy for EOS usr. (that just my opinon )
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@Shjim fair enough. 
I do not remember if the service was enabled by default but in thory it could be enabled without running the system directly.
Note: this may break the RPi system. So backup accordingly.
Connect your SD card to your (main) computer.
Mount the root partition of the sd card system - you can check sudo fdisk -l which one it may be.
sudo mount /dev/mmc0blkwhatever1 /mnt
Add symlink to enable ssh service. (check first if it already exists in /mnt/etc/systemd/system/multi-user.target.wants/sshd.service to make sure if this approach is really the root cause of the problem).
ln -s /usr/lib/systemd/system/sshd.service /mnt/etc/systemd/system/multi-user.target.wants/sshd.service
update /mnt/etc/ssh/sshd_config file to your liking
sync and sync again (you can never be too sure )
sudo umount /mnt
Put SD card into the RPi and see if that works.
The connection may be also blocked by firewall (I do not know the default setup) in which case I do not know how to change it without booting the system.
edit: This assumes you already have the system installed on the SD card.
If one follows this guide to install a headless server, there are absolutely nothing graphical installed. Having used the following guide:
I ended up with this neofetch
Neofetch shows
the os as Arch Linux ARM aarch64
the Packages as 211 (pacman)
the memory used as 91MiB
If I remember correctly, yay and pahis are the only two included packages from the EndeavourOS package repository.
This is about as stripped as a headless server as can be. Not even x11
Then as @Shjim suggeted, there are seven how-tos for setting up your headless server with Samba, minidlna, etc.
https://discovery.endeavouros.com/category/arm/
Pudge
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