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DrillDown Icon Cyberoam Security Appliances (UTM and NGFW)
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DrillDown Icon How to disable Email notification for virtual host failover?
DrillDown Icon Open a Specific Port in Cyberoam
DrillDown Icon Configure Virtual Host using FQDN
DrillDown Icon Configure HTTPS inspection using third-party Certificate
DrillDown Icon Exclude Users’ Data Accounting for Specific Traffic
DrillDown Icon Block Internet access for IPv6-based traffic
DrillDown Icon Import Trusted MAC Address from CSV File
DrillDown Icon Allow Remote Desktop Connection of Internal Network Resources over Internet
DrillDown Icon Allow Only Email Traffic While Blocking All Internet Access
DrillDown Icon Does Cyberoam protect the network against IP Spoofing?
DrillDown Icon Configure Location-aware Identity-based Access Control Policy
DrillDown Icon Configure Virtual Host with Load Balancing and Health Checking
DrillDown Icon Allow Access to Internal Server Behind Cyberoam Using Non-Standard Port
DrillDown Icon Create a Schedule Based Firewall Rule
DrillDown Icon How to create a Country-based Firewall Rule
DrillDown Icon Create Source NAT Policy in Cyberoam
DrillDown Icon Create DoS Bypass Rule
DrillDown Icon Configure Port Forwarding using Virtual Host to access devices on Internal network
DrillDown Icon Publish Internal Server over Internet
DrillDown Icon Block Internet Access Based on MAC Address
DrillDown Icon Configure Policy-based Routing
DrillDown Icon How can I protect my network’s internal resources from becoming zombies and being illegitimately used for Spamming?
DrillDown Icon How to find out the country to which an IP Address belongs?
DrillDown Icon How to NAT Cyberoam generated traffic?
DrillDown Icon Why client computers are not able to get DHCP lease IP after deployment of Cyberoam in bridge mode between DHCP Server and Clien
DrillDown Icon How can we enable Strict Authentication for unauthenticated users?
DrillDown Icon Create Reflexive Firewall Rules to publish Internal Server
DrillDown Icon How to prevent TCP Split Handshake spoof attack?
DrillDown Icon VPN
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DrillDown Icon Web Filter
DrillDown Icon Application Filter
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DrillDown Icon Quality of Service (QoS)
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Open a Specific Port in Cyberoam

Applicable Version: 10.00 onwards


In order to allow certain services to traverse through Cyberoam, administrator has to open the necessary port(s). This can be done by allowing traffic through those services, or ports, using Firewall Rule. 

This article describes how we can open a port in Cyberoam.


Open SMTP Port 25 to allow Email communication through Cyberoam.


You must be logged on to the Web Admin Console as an administrator with Read-Write permission for relevant feature(s).

Step 1: Create an IP Host

Go to Object > Host > IP Host and click Add to create a new host.  






Specify a name to identify the IP Host.

IP Family


Select the type of IP Family.


Available Options:






Select the type of host.


Available Options:


Single IP Address

Network IP Address with subnet

IP Range

IP List




Only Class B IP Addresses can be added in IP list. IP Addresses can be added or removed from IP list.


IP Address

Specify IPv4 Address or IPv6 Address based on the Host Type selected.


Click OK to save the IP Host. 

Step 2: Add a Firewall Rule        

Go to Firewall > Rule > Rule and click Add to create a new Firewall Rule.  





Allow SMTP

Specify a name to identify the Firewall Rule.

Zone (Source-Destination)


Select source and destination zone to which the rule applies.


MailServer — Any IP Address

Specify source and destination host or network address to which the rule applies.



Select Services/Service Group to which the Firewall rule applies.


All The Time

Select schedule for the rule.



A new schedule can also be added directly from here.




Select rule action.


Available Options:


AcceptAllow access

DropSilently Discard

RejectDeny access



Click OK to save the Firewall Rule. 

The above configuration allows Cyberoam to open an SMTP port.








                                                                                                                                                 Document Version: 1.0 – 08 May, 2015

Article ID: 3121