if you want to backup linux System, you can use script,ex:tar,cpio . because urbackup just support file backup for linux.
you can restart the service of urbackup server and restart the service of client on centos7, then check the firewall of server and clients
If the client and server are not on the same local LAN, then generate the host in the server web console and copy/paste the code that is generated after clicking through setup. it would be something similiar to:
This script is not from Greenbone nor supported by this forum, please contact the creator by his website. Please note the GSE is as it is, so no install support is possible here expect from the community on fully voluntary basis.
I had the same issue. I believe its because centos7 uses python2 by default and GVM has python3 as a dependency.
This is how I fixed it
yum install -y python3
yum --enablerepo=extras install epel-release
yum install python-devel
yum install libffi-devel
yum install openssl-devel
yum install python-pip
pip install paramiko
pip install --upgrade pip