From few days I'm trying to running "yum update" and all time got an error.
 

[root@pranay ~]#yum update
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Update Process
Loading mirror speeds from cached hostfile
* base: centos.mirror.net.in
* elrepo: dfw.mirror.rackspace.com
* epel: epel.mirror.net.in
* extras: centos-hn.viettelidc.com.vn
* updates: centos-hn.viettelidc.com.vn
http://dl.atrpms.net/el6-x86_64/atrp...ta/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 504 Gateway Time-out"
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: atrpms. Please verify its path and try again

It's possible that the repo is down.
Servers are sometimes taken off-line at the wee hours in the morning for maintenance.

There could be an issue with the atrpms repo. If so just disable that repo until you can identify the problem.

Maybe these links will help.

https://access.redhat.com/solutions/45815
http://unix.stackexchange.com/questi...omd-xml-for-re
https://www.centos.org/forums/viewtopic.php?t=6503\
http://forums.fedoraforum.org/showthread.php?t=223472

may be this It's been awhile.

well seeing as ATrpm's has been not just down but no longer exists
and that this is NOT a new issue

atrpm went off line for over year

as i recall the last update on atrpm was in 2014
--- a old mirror
https://www.mirrorservice.org/sites/...s.net/?C=M;O=D
-- 2014