Installation Error: Trying other mirror.

[linux-newbie2]

Hi,
I am very new to linux (centos 7) and while installing some softwares/packages I end up always with something like this error which seems trying to download some package from internet but didn't reached:

[root@localhost ~]# yum update -y && reboot
.
.
.

firefox-52.6.0-1.el7.centos.x8 FAILED
http://mirror.fra10.de.leaseweb.net/...os.x86_64.rpm: [Errno 12] Timeout on http://mirror.fra10.de.leaseweb.net/...os.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
java-1.8.0-openjdk-headless-1. FAILED
http://mirror.fra10.de.leaseweb.net/..._4.x86_64.rpm: [Errno 12] Timeout on http://mirror.fra10.de.leaseweb.net/..._4.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
firefox-52.6.0-1.el7.centos.x8 FAILED
http://mirror.eu.oneandone.net/linux...os.x86_64.rpm: [Errno 12] Timeout on http://mirror.eu.oneandone.net/linux...os.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
java-1.8.0-openjdk-headless-1. FAILED
http://mirror.eu.oneandone.net/linux..._4.x86_64.rpm: [Errno 12] Timeout on http://mirror.eu.oneandone.net/linux..._4.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
firefox-52.6.0-1.el7.centos.x8 FAILED
http://ftp.hosteurope.de/mirror/cent...os.x86_64.rpm: [Errno 12] Timeout on http://ftp.hosteurope.de/mirror/cent...os.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
java-1.8.0-openjdk-headless-1. FAILED
http://mirror.maeh.org/centos/7.4.17..._4.x86_64.rpm: [Errno 12] Timeout on http://mirror.maeh.org/centos/7.4.17..._4.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
firefox-52.6.0-1.el7.centos.x8 FAILED
http://de.mirror.guru/centos/7.4.170...os.x86_64.rpm: [Errno 12] Timeout on http://de.mirror.guru/centos/7.4.170...os.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
java-1.8.0-openjdk-headless-1. FAILED
http://mirror.cuegee.de/centos/7.4.1..._4.x86_64.rpm: [Errno 12] Timeout on http://mirror.cuegee.de/centos/7.4.1..._4.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
firefox-52.6.0-1.el7.centos.x8 FAILED
http://centos.mirror.net-d-sign.de/7...os.x86_64.rpm: [Errno 12] Timeout on http://centos.mirror.net-d-sign.de/7...os.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
java-1.8.0-openjdk-headless-1. FAILED
http://ftp.wrz.de/pub/CentOS/7.4.170..._4.x86_64.rpm: [Errno 12] Timeout on http://ftp.wrz.de/pub/CentOS/7.4.170..._4.x86_64.rpm: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.
.
.
.
Error downloading packages:
firefox-52.6.0-1.el7.centos.x86_64: [Errno 256] No more mirrors to try.
1:java-1.8.0-openjdk-headless-1.8.0.161-0.b14.el7_4.x86_64: [Errno 256] No more mirrors to try.

[root@localhost ~]#


I don't know whether it is due to firewall or something else.
can anybody please help?

[jeremy31]

Moved to Fedora, Red Hat and derivatives