Yum kann nicht auf RHEL 7.2 verwendet werden

Ich verwende derzeit RHEL Server 7.2 und jedes Mal, wenn Sie einen yum-Befehl ausführen (sogar grundlegende Dinge wie Update, Installation, lokale Installation usw.), erhalte ich die folgende Fehlermeldung:

One of the configured repositories failed (Unknown),  and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this:  1. Contact the upstream for the repository and get them to fix the problem.  2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work).  3. Disable the repository, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage:  yum-config-manager --disable <repoid>  4. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise:  yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true  Cannot retrieve metalink for repository: epel/x86_64. Please verify its path and try again 

Ich habe gelesen, dass ein Weg zur Behebung dieses Problems darin besteht, alle Instanzen von "https" in "/etc/yum.repos.d/epel.repo" in "http" zu ändern. Dies funktionierte jedoch nicht für mich. Ich habe auch versucht, die SSL-Zertifikate ohne Erfolg zu aktualisieren. Irgendwelche Gedanken? Vielen Dank!

-Edit Dies ist ein Terminal an meiner Schule (Penn State Berks). Es ist eine der wenigen auf dem Campus eingerichteten Linux-Boxen, daher gibt es wenig bis keine Unterstützung dafür. Es ist für mein Forschungsprojekt eingerichtet, so dass nur ich und der Professor es jemals verwenden. Alle Netzwerkeinstellungen, einschließlich der DNS-Einstellungen, wurden zuvor von der Schule konfiguriert.

-Edit Ich habe versucht, den Befehl yum update auszuführen, aber das Epel-Repo wurde deaktiviert. Dies war das Ergebnis:

773 physics10 -- /home/student/Desktop/tmux-x86_64-rhel6>yum update --disablerepo=epel/x86_64 Loaded plugins: langpacks, product-id, rhnplugin, search-disabled-repos, subscription-manager This system is receiving updates from RHN Classic or Red Hat Satellite.   Error getting repository data for epel/x86_64, repository not found 774 physics10 -- /home/student/Desktop/tmux-x86_64-rhel6>yum update --disablerepo=epel Loaded plugins: langpacks, product-id, rhnplugin, search-disabled-repos, subscription-manager This system is receiving updates from RHN Classic or Red Hat Satellite. http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') Trying other mirror. http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') Trying other mirror. http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') Trying other mirror. http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') Trying other mirror. http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') Trying other mirror. http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') Trying other mirror. http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') Trying other mirror. http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') Trying other mirror. http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') Trying other mirror. http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') Trying other mirror.  One of the configured repositories failed (Nux.Ro RPMs for general desktop use), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this:  1. Contact the upstream for the repository and get them to fix the problem.  2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work).  3. Disable the repository, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage:  yum-config-manager --disable nux-dextop  4. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise:  yum-config-manager --save --setopt=nux-dextop.skip_if_unavailable=true  failure: repodata/repomd.xml from nux-dextop: [Errno 256] No more mirrors to try. http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://li.nux.ro/download/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.li.nux.ro/li.nux.ro/nux/dextop/el7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds') 775 physics10 -- /home/student/Desktop/tmux-x86_64-rhel6>