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Firewall RulesCloud Servers Blocked Network Ports

This page lists Ports that are Blocked both inbound and outbound from our Cloud Server Network.

We often find that customers expose services on their Windows Cloud Servers which can be used to compromise their Server. If these services are left open on the Internet they reveal information such as Windows Usernames or Remote Procedure Call Services that can be abused by bad actors to take control of Windows Servers and use them as part of a botnet.


To protect Customers Windows Cloud Servers we block the following Ports both inbound and outbound to our Cloud Server Network.



Incoming

Service Port Protocol
Kerberos Auth Service 88 TCP/UDP
Network Time Protocol (NTP) 123 UDP
Windows Management Instrument (WMI) 135 TCP
NetBios 137 to 139 TCP
Lightweight Directory Access Protocol (LDAP) 389 UDP
SMB File Sharing 445 TCP/UDP
Kerberos Admin Service 464 TCP/UDP
Intelligent Platform Management Interface (IPMI) 623 UDP
MS-SQL Server Resolution Service 1434 UDP
Remote Desktop Services (RDP)
(Restricted access, please Contact Support for whitelisting)
3389 TCP/UPD
Windows Remote Procedure Calls (RPC) 49152 - 49157 TCP



We also implement BCP38 Compliance to prevent abuse of our network using spoofed IP Attacks. www.bcp38.info


If you require a custom set of Firewall Rules or need to have ports opened or close please Create a Support Ticket through your Client Area account to discuss your individual needs.

Web Wiz also highly recommend that you run your own Software Firewall on your Windows Cloud Server as an extra layer of protection.

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