Here is the output of yum repolist:
[root@nagios
xi ~]# yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
epel/x86_64/metalink | 17 kB 00:00
* base: ftpmirror.your.org
* epel: fedora-epel.mirror.lstn.net
* extras: mirror.mia11.us.leaseweb.net
* updates: reflector.westga.edu
base | 3.6 kB 00:00
extras | 3.4 kB 00:00
mcp | 2.5 kB 00:00
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
base/7/x86_64/primary_db | 6.0 MB 00:01
epel/x86_64/primary_db | 6.1 MB 00:01
extras/7/x86_64/primary_db | 215 kB 00:00
mcp/primary_db | 6.1 kB 00:00
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
https://repo.nagios.com/nagiosxi-deps/7 ... repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable"
Trying other mirror.
updates/7/x86_64 | 3.4 kB 00:00
updates/7/x86_64/primary_db | 7.4 MB 00:01
repo id repo name status
base/7/x86_64 CentOS-7 - Base 10,019
epel/x86_64 Extra Packages for Enterprise Linux 7 - x86_64 12,568
extras/7/x86_64 CentOS-7 - Extras 435
mcp Management Component Pack 5
nagios-base Nagios 0
nagios
xi-deps Nagios
xi Dependencies 0
updates/7/x86_64 CentOS-7 - Updates 2,500
repolist: 25,527
Here is the connection output for curl -k -L -v
https://repo.nagios.com/nagiosxi-deps/7:
[root@nagios
xi ~]# curl -k -L -v
https://repo.nagios.com/nagiosxi-deps/7
* About to connect() to repo.nagios.com port 443 (#0)
* Trying 72.14.181.71...
* Connection refused
* Trying 2600

:f03c:91ff:fedf:b821...
* Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable
* Failed connect to repo.nagios.com:443; Network is unreachable
* Closing connection 0
curl: (7) Failed to connect to 2600

:f03c:91ff:fedf:b821: Network is unreachable
[root@nagios
xi ~]#