注意這個問題報錯顯示也可以是：

curl:(56)Recv failure:連接被對方重設

Issue:

When you execute Yum installation or update, you may encounter following error:

[plain]?view plain?copy

Loaded?plugins:?fastestmirror,?langpacks??

Could?not?retrieve?mirrorlist?http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock?error?was??

<span?style="color:#FF0000;">14:?curl#56?-?"Recv?failure:?Connection?reset?by?peer"</span>??

??

??

?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.?Run?the?command?with?the?repository?temporarily?disabled??

????????????yum?--disablerepo=<repoid>?...??

??

?????4.?Disable?the?repository?permanently,?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>??

????????or??

????????????subscription-manager?repos?--disable=<repoid>??

??

?????5.?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?find?a?valid?baseurl?for?repo:?base/7/x86_64??

Solution:

Try to turn off firewall:

systemctl disable firewalld systemctl stop firewalld

or

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sudo?systemctl?stop?firewalld.service??

sudo?systemctl?disable?firewalld.service??

總結

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