Is there any port restriction? Are the ports open by default?

Almost all ports are open by default on all our data centers; however, the following ports are permanently blocked in the following data centers for security reasons, and cannot be lifted.

Here are the details:
The SMTP ports (25, 587, 465, and 2525) are blocked on our Cloud platform (panel.cloudzy.com), as well as a few regions on the legacy VPS platform (support.cloudzy.com):

Dallas (High-end CPU) and Chicago, IL datacenters,

And also, some other ports on our other data centers are closed and here they are:
 
UK
Netherlands
Singapore
US:
Phoenix, AZ
New York City
Washington D.C
Seattle, WA
Los Angeles, CA
San Francisco, CA
Miami, FL

udp/137 
udp/139
udp/11211
udp/1432
tcp/135
tcp/136 
tcp/137
tcp/138 
tcp/139 
tcp/445 
tcp/593 
tcp/4444

That's it.
Any ports other than the above ones are open on our data centers, and you may need to open the port on the VPS OS firewall if needed.
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