2 Exchange 2013 servers - outlook switching between servers again and again

Hello,

I just migrated from two 2007 servers to 2013.
One domain, different cities, Server2 is connected to the main Server1 by openVPN
Server1 is SP1
Server2 is CU10
Both are multirole.
There is a firewall at the edge of Server1 domain, which has public IP, where is MX record redirected to.
Server2 hasn't got any public IP

As I'm not much familiar configuring Exchange servers, I've had a lot of problems.
Emails from Server1 were going through slow (ADSL with realy bad upload) Server2
I "solved" it by disabling all receive conectors on Server2.
Emails sent by Server2 where stucking in draft folder, so I tried to change DNS lookup. I set the public IP as external and IP of the Server1's location DC as internal.

So the current problem is that if users which has mailboxes behind Server1 open Outlook clients (07,10,13) it sometimes redirects them to Server2. It happens almost every time they open outlook. Server1, than Server2 and so on...

There are default certificates, no autodiscover record in DNS, 'cause I don't know how exactly to configure autodiscover right.
If you want to see a screenshot, feel free to tell me.

Thank you.
Gar3nAsked:
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AmitIT ArchitectCommented:
In your case, you need an onsite consultant, who can help  you in design part. Or if you have MS premier support, they can also help  you out.
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Gar3nAuthor Commented:
Unfortunately I havent got any premier support.
Everything seems OK now but the switching servers.
I just thought that someone of you already met with this issue or could know what I forgot to configure.
Thank you.
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Gar3nAuthor Commented:
The issue is solved.
I made sites between those servers. Clients are now connecting to right DC.
After that, I also had to enable receive connectors on Server2 to correct mail flow.
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