Can I change main domain on my raq4i without any problems ?
I need to move domain to another server. I have more than 3-4 sites already hosted on both of the servers.
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As long as the main domain is pointing to your server and is propregated, you should be able to change it without any problems.

As a courtesy, you might want to let your hosting service know of the name change via a quick email to their support team.

Sometimes they use the main domain name as one of the ways they identify the box.