Para standard corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update/standard/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update.repo
zypper refresh
zypper install openssh-server
Para SUSE SLE-15-SP5 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update/SUSE_SLE-15-SP5/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update.repo
zypper refresh
zypper install openssh-server
Para SUSE SLE-15-SP4 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update/SUSE_SLE-15-SP4/home:MSirringhaus:branches:SUSE:SLE-15-SP3:Update.repo
zypper refresh
zypper install openssh-server