ERROR: Unable to retrive Zimbra GPG key for package validation

[thanhtien19]

Hello
today I just install Zimbra zcs-8.7.3_GA_1750.RHEL7_64.20170215042321 then when install it show error as below
Use Zimbra's package repository [Y] Y
Importing Zimbra GPG key





ERROR: Unable to retrive Zimbra GPG key for package validation
Please fix system to allow normal package installation before proceeding
[root@mail zcs-8.7.3_GA_1750.RHEL7_64.20170215042321]#

I install it in Centos 7
please everyone help me , I find more in forum but can not see way to fix it
Thanks

[DualBoot]

If you have a FireWall check it allows TCP out on port 11371
Regards,

[thanhtien19]

Hello
You mean I must I open port from server to internet with port is 11371 ?
Thanks

[DualBoot]

Yes.
Regards,

[rosch]

If nothing helps, it's most probably a DNS issue. In that case set your DNS to google, i.e. 8.8.8.8:

https://unix.stackexchange.com/question ... -a-failure