If I remember correctly from reading along here in the forum
there was an announcement that this particular mirror was taken down - quite some time ago.
The remedy therefore should be, as in all such cases where download from some mirror fails:
refresh the mirror list
so that this one is no longer attempted to be used.
Perhaps the build iso is somewhat special and the mirror needs to be adjusted manually.
I don’t know, have never used it.
same issue with your help, the server is no more .eu but .org
same issue with
https://manjaro.moson.eu/testing/$repo/$arch
######################################################
################ manjaro-tools.conf ##################
######################################################
# default target branch
# target_branch=stable
# default target arch: auto detect
# target_arch=$(uname -m)
# cache dir where buildpkg, buildtree cache packages/pkgbuild, builiso iso files
# cache_dir=/var/cache/manjaro-tools
# build dir where buildpkg or buildiso chroots are created
# chroots_dir=/var/lib/manjaro-tools
# log dir where log files are created
# log_dir='/var/log/manjaro-tools'
# custom build mirror server
# build_mirror=https://manjaro.moson.org/
################ buildtree ###############
issue
[nls@lap ~]$ buildiso -f -p lxqt -b testing -k linux515 2022.11.13
--> Profile: [lxqt]
==> Start building [lxqt]
==> Cleaning up ...
-> Deleting chroot [rootfs] (x86_64) ...
-> Deleting isoroot [iso] ...
--> Loading Packages: [Packages-Root] ...
==> Prepare [Base installation] (rootfs)
--> mirror: https://manjaro.moson.eu/testing/$repo/$arch
==> Creating install root at /var/lib/manjaro-tools/buildiso/lxqt/x86_64/rootfs
-> Installing packages to /var/lib/manjaro-tools/buildiso/lxqt/x86_64/rootfs
:: Synchronizing package databases...
core.db failed to download
error: failed retrieving file 'core.db' from manjaro.moson.eu : Failed to connect to manjaro.moson.eu port 443 after 47 ms: Couldn't connect to server
error: failed to synchronize all databases (download library error)
==> ERROR: Failed to install packages to new root
==> ERROR: Failed to install all packages