Exchange installation problem

Question

Error:
The DNS domain name is invalid. It contains characters other than 'A'-'Z', 'a'-'z', '0'-'9', '.' and '-'.
For more information, visit: http://technet.microsoft.com/library(EXCHG.150)/ms.exch.setupreadiness.ServerNameNotValid.aspx
Warning:
Installing Exchange Server on a domain controller will elevate the permissions for Exchange Trusted Subsystem to domain administrators.
For more information, visit: http://technet.microsoft.com/library(EXCHG.150)/ms.exch.setupreadiness.WarningInstallExchangeRolesOnDomainController.aspx
Warning:
Setup will prepare the organization for Exchange 2013 by using 'Setup /PrepareAD'. No Exchange 2010 server roles have been detected in this topology. After this operation, you will not be able to install any Exchange 2010 servers.
For more information, visit: http://technet.microsoft.com/library(EXCHG.150)/ms.exch.setupreadiness.NoE14ServerWarning.aspx

Answer 1

Hello,
It is not recommended that installing exchange server on a DC server.
According to the error, the DNS domain name set on the local computer is invalid. You can refer to the following article to solve the issue. (Note:Based on my known, it also applies to exchange 2013)
http://technet.microsoft.com/en-us/library/bb430742(v=exchg.80).aspx
For the third warning, you can ignore it.
Cara Chen
TechNet Community Support