Mimecast Web Security: Prerequisites

Document created by user.oxriBaJeN4 Employee on Jul 3, 2018Last modified by user.oxriBaJeN4 Employee on Jun 21, 2019
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To use the Mimecast Web Security feature, the following prerequisites must be met:


Device Protection using the Mimecast Security Agent (MSA)

Network Level Protection
Administrator access (User ID & Password) is required on each computer. This is required so the DNS settings for the Network Adapter can be set to use the Mimecast Web Security gateway.YN
Administrator access (User ID & Password) is required on the firewall to configure your web security settings during the Connect session.NY
Your firewall must allow requests to pass through port 53 to the Mimecast Web Security gateway servers. For example:
  • Source: UDP/TCP port 53
  • Destination: &
Ensure traffic for these devices isn't intercepted or filtered elsewhere on the network.
You must not block IP addresses from South Africa via a Geographical Restrictions Policy. Although the Mimecast Web Security gateway servers are distributed around the world, the IPs are registered in South Africa.YY
The egress IP is required when configuring your Mimecast Web Security gateway locations. The egress IP is the public IP address used to send requests and must be in CIDR format.NY
Browsers must have cookies enabled to display block pages. If cookies are disabled, block pages won't display.YY
The minimum supported Mac OS version is macOS Sierra (10.12).YY

The minimum supported Windows OS version is Windows 7 or later. This can be either the Pro X86, Pro X64, Enterprise X86, or Enterprise X64 edition.

The Home edition doesn't support enterprise features of MSMQ, resulting in the failure.
A role with write access to the following Mimecast Administration Console menu items, to configure your  Mimecast Web Security gateway:
  • Gateway | Policies
  • Web Security
Managed endpoint systems should use a Network Time Provider to ensure accurate system clocks.YN


See Also...