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What are you primary DNS servers on the exchange server set to? it should be pointing to your DC
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Before installing exchange, you need to set the second servers' DOMAIN to the IP or hostname of the domain controller. This will be an option on the server configurator window that pops up on startup, or you can use the Server Admin tool.
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This is due to incorrect configuration of sites and services, Please configure it.<br />
<a href="https://community.spiceworks.com/topic/144971-how-to-connect-two-dc-using-ad-site-and-service" rel="ugc">https://community.spiceworks.com/topic/144971-how-to-connect-two-dc-using-ad-site-and-service</a><br />
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How many AD sites u have?<br />
If you have multilple AD sites install an ADC in the exchange AD site and configrue schema master in that.
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thanks all for your help;<br />
So I have 3 AD sites but no subnets identified and I've pointed the exchange server to the main DC as DNS.
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I just want to add that All my servers are in the same network.
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If you want to add all servers in same network you need to assign same IP rage if the DC installed for Exchange. Then rerun the setup
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thanks experts for your help, the istallation is working great now after identifying the subnet in active directory sites and services.
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<div class="content wysiwyg-content">
Hello dear experts;<br />
I have a problem with my Exchange server, <br />
<br />
In my architecture I have a first main server which is my DC, a second server( the server is in the domain) on what I tried to install Exchange 2010 but I always got the same error: unable to get Active Directory Site in which belong the server; this server doesn't belong to a valid Active Directory Site.<br />
<br />
&nbsp;How can I solve this problem and have exchange installed on my second server??<br />
In attach you can find the error capture. <br />
<br />
thanks in advance!!!<a href="https://filedb.experts-exchange.com/incoming/2016/03_w11/1085315/error-exchange.PNG" target="_blank" title="Exchange 2010 (71 KB)"><img alt="Exchange 2010" class="file-block lazyload" style="max-width: 639px;" data-src="https://filedb.experts-exchange.com/incoming/2016/03_w11/1085315/error-exchange.PNG" /></a>
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error-exchange.PNG

Hello dear experts;
I have a problem with my Exchange server, 

In my architecture I have a first main server which is my DC, a second server( the server is in the domain) on what I tried to install Exchange 2010 but I always got the same error: unable to get Active Directory Site in which belong the server; this server doesn't belong to a valid Active Directory Site.

 How can I solve this problem and have exchange installed on my second server??
In attach you can find the error capture. 

thanks in advance!!!

Exchange server 2010

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.