Problem in PGP signature of a mirror - an administrative problem

i know this is an administrative affair and i am not the administrator of our network.
i asked our network administrator to launch a mirror of arch in our university and he kindly did it and it is know listed in arch mirror list. the problem is that when i update the package list it gives me error regarding PGP signature and i can not update or install package. when i update the database using another mirror, it works fine and even i can update the packages using our mirror. so the problem is only the PGP signature of our mirror.
since our admin does not work with arch, i decided to ask it here and pass him the solution.
the address of our mirror is : http://mirror.yazd.ac.ir/arch/
and here is the output of pacman -Syyu
[root@civil-cfd ~]# pacman -Syyu
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
:: Synchronizing package databases...
core 108.9 KiB 111K/s 00:01 [######################] 100%
error: GPGME error: No data
error: failed to update core (invalid or corrupted database (PGP signature))
extra 1482.3 KiB 138K/s 00:11 [######################] 100%
error: GPGME error: No data
error: failed to update extra (invalid or corrupted database (PGP signature))
community 2.1 MiB 139K/s 00:16 [######################] 100%
error: GPGME error: No data
error: failed to update community (invalid or corrupted database (PGP signature))
archlinuxfr 12.2 KiB 197K/s 00:00 [######################] 100%
error: database 'core' is not valid (invalid or corrupted database (PGP signature))
error: database 'extra' is not valid (invalid or corrupted database (PGP signature))
error: database 'community' is not valid (invalid or corrupted database (PGP signature))

Allan,
i did not change the options in pacman.conf file. and note that when i disable this mirror in "/etc/pacman.d/mirrorlist" and use other mirror, the commands work well. so the problem is related to this mirror.
ewaller,
it is a pure Arch installation not Antergos or any other branch of Arch.
Last edited by hadian (2014-04-06 07:55:29)

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