CentOS 6.8 Yum cannot connect?

[sancho85]

Friends, Please help me with this.
Server at work needs to be patched and yum stopped working for some reason.

Network is ok, i can ping 8.8.8.8. DNS works ok, resolves the names. Stoping iptables didn't helped.
did yum clean all. spend all yesterday googling the solution and didn't find anything.
Hope someone can give me here an advice.

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# yum update

Loaded plugins: fastestmirror
Setting up Update Process
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os&inf...
14:PYCURL ERROR 56 - "Failure when receiving data from the peer"
Error: Cannot find a valid baseurl for repo: base

[TrevorH]

That looks like some firewall is blocking connections outbound. If you ping something and get a reply, that doesn't mean you can access its other services. Are you behind a web proxy? Can you run curl "http://mirrorlist.centos.org/?release=6 ... 64&repo=os" and get a useful response?

[sancho85]

There is no Proxy, just the gateway that NATs me to internet.
But curl didn't bring me a useful response. Does it mean that CentOS is ok and I need to look for the resolution in network?
Tried to disable local firewall but no use...

[avij]

Please cut & paste the response that you got when you ran that curl command above.

[sancho85]

Please cut & paste the response that you got when you ran that curl command above.

[root@NNNNNNN ~]# curl http://mirrorlist.centos.org/?release=6 ... 64&repo=os
[1] 21387
[2] 21388
[root@ NNNNNNN ~]# curl: (7) Failed to connect to 2001:4178:5:200::10: Network is unreachable

[root@ NNNNNNN ~]# curl http://mirrorlist.centos.org/
curl: (7) Failed to connect to 2604:1580:fe02:2::10: Network is unreachable

[sancho85]

That looks like some firewall is blocking connections outbound. If you ping something and get a reply, that doesn't mean you can access its other services. Are you behind a web proxy? Can you run curl "http://mirrorlist.centos.org/?release=6 ... 64&repo=os" and get a useful response?

couldn't curl anything on internet. above you can find the response.
does it mean that problem is outside of Centos?

[avij]

If this one works

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ping -c 3 8.8.8.8

but this one does not

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curl -4 mirrorlist.centos.org

(should report back "Invalid release")

then it's likely that some firewall is blocking connections outbound. Please ask your network admin.

[sancho85]

If this one works

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ping -c 3 8.8.8.8

but this one does not

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curl -4 mirrorlist.centos.org

(should report back "Invalid release")

then it's likely that some firewall is blocking connections outbound. Please ask your network admin.

Here is the command and output

curl -4 mirrorlist.centos.org
curl: (7) couldn't connect to host

[sancho85]

That looks like some firewall is blocking connections outbound. If you ping something and get a reply, that doesn't mean you can access its other services. Are you behind a web proxy? Can you run curl "http://mirrorlist.centos.org/?release=6 ... 64&repo=os" and get a useful response?

Does this tell you anything?

[sancho85]

in yum.conf I found this line:

proxy=http://127.0.0.1:3128

proxy pointing to localhost. Can it be the reason?

also in Centos-Base.repo file baseurl is commented. Is it how it is supposed to be?


[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$ ... fra=$infra
#baseurl=http://mirror.centos.org/centos/$releas ... $basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6