Dear all
I was trying to clean cache by using "yum cleanall" command after that i tried yum update, but it is ging fallowing error
bash-4.1# yum update
Loaded plugins: fastestmirror, refresh-packagekit
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?releas...h=i386&repo=os error was
14: PYCURL ERROR 22 - "The requested URL returned error: 407"
Error: Cannot find a valid baseurl for repo: base

The 407 error seems like network problem.
I had http proxy problem earlier but i solved it then by including username and password in "yum.conf"
proxy=http://10.100.15.3:8080
proxy_username=asomavarapu%40actrec.gov.in
proxy_password=ymcv121

and also included env variable as fallows
http_proxy=http://10.100.15.3:8080
HTTP_PROXY=http://10.100.15.3:8080

i am not able to understand this new problem,i found that the folders in var/cache/yum were empty i think yum cleanall command might have deleated all the files related to yum .

can any one please explain what is the actual reason for yum not working in my case.

Thanking you.

it shows again proxy issue.
Might be your location internet problem or proxy user name and password is changed.

Check the internet first in the Server ,are you able to access with username and password

Hi sharadchhetri

Iam able to access internet in my system with my username and password.
before yum was working fine.
Iam facing this problem after doing yum cleanall step.
i checked yum.conf and it is fine with proxy, username and password
proxy=http://10.100.15.3:8080
proxy_username=asomavarapu%40actrec.gov.in
proxy_password=ymcv121
i dont know what else files it has changed or deleted, which makes yum not working.

Try again , yum update.
If it is failed.
Check the logs.