ftp.halifax.rwth-aachen.de issue

apt install jenkins
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  jenkins
0 upgraded, 1 newly installed, 0 to remove and 6 not upgraded.
Need to get 91.2 MB of archives.
After this operation, 93.4 MB of additional disk space will be used.
Err:1 https://pkg.jenkins.io/debian-stable binary/ jenkins 2.462.1
  Temporary failure resolving 'ftp.halifax.rwth-aachen.de'
E: Failed to fetch https://ftp.halifax.rwth-aachen.de/jenkins/debian-stable/jenkins_2.462.1_all.deb  Temporary failure resolving 'ftp.halifax.rwth-aachen.de'
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

ping ftp.halifax.rwth-aachen.de
ping: ftp.halifax.rwth-aachen.de: Temporary failure in name resolution