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Hyper-V & Dedicated Server Blocked Network Ports

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

We often find that customers expose services on their 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 Servers we block the following Ports both inbound and outbound to our 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	TCP/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
HSRPHot Standby Router Protocol (HSRP)	1985	UDP
Remote Desktop Services (RDP) (Restricted access, please Contact Support for whitelisting)	3389	TCP/UPD
ADB.Miner Cryto Miner Botnet	5555	TCP
SmarterMail Remote SYSTEM RCE Vulnerbility	17001	TCP
mDNS and Bonjour	5353	UDP
Link-Local Multicast Name Resolution	5355	TCP
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 Server as an extra layer of protection.

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

Incoming