License had expired problem

[Sakamoto Ryōma]

Hello,
My lifetime licenses are set correctly on my directadmin user panel related to server IP/OS/Expiration date.
I just finished installing directadmin on two vps servers (centos7x64), one is from linode, another one is from vultr.
Both uses etc0 as network interface.
I tried everything on manual license update help : http://help.directadmin.com/item.php?id=30
On directadmin error log,

2016:01:23-15:24:40: ConfigFile::writeFile(./data/admin/admin.usage) : Timestamp from when it was read is different, overwriting anyway
2016:01:23-15:24:40: ConfigFile::writeFile(./data/admin/admin.allocation) : Timestamp from when it was read is different, overwriting anyway
2016:01:23-16:05:18: License is not valid: The start and expiry times are not in the license file<br>
The start and expiry times are not in the license file<br>

I updated server date, and server local date to Istanbul time.

[root@sydney01 scripts]# date
Sat Jan 23 19:31:28 EET 2016
[root@sydney01 scripts]# ls -l /etc/localtime
lrwxrwxrwx 1 root root 37 Jan 23 19:31 /etc/localtime -> ../usr/share/zoneinfo/Europe/Istanbul

Apache is running, 2222 port is open and I also tried with firewall closed.

I also changed OS of vps on linode to Centos6x64 but I still have the same problem. Directadmin install without problem but it says license expired. (I install prerequisites according to OS version from installation explanation page of directadmin)

I also checked license file of another server which works fine, but I did not see much difference on the files (both are encrypted but the structure was very similar) (Both start with "version=1.3" and then encrypted text)

Do you have any idea or suggestion? Am I missing something?