正文：
RHEL:
| 链接 | 端口 |
| subscription.rhn.redhat.com | 443 |
| subscription.rhsm.redhat.com | 443 |
| cdn.redhat.com | 443 |
| *.akamaiedge.net | 443 |
| *.akamaitechnologies.com | 443 |
SLES:
| 链接 | 端口 |
| scc.suse.com | 443 |
| updates.suse.com | 443 |
| installer-updates.suse.com | 443 |
参考文献：
https://access.redhat.com/solutions/6209112
https://www.suse.com/support/kb/doc/?id=000020836