Set-ClientAccessRule – use this cmdlet to modify existing rules.New-ClientAccessRule –this cmdlet lets you create new rules.Get-ClientAccessRule – this cmdlet will return the results showing a list of currently configured rules.There are different cmdlets available to manage Client Access Rules. By default, the oldest rules have the highest priority, so they are processed first. The lower the number, the higher the priority. Priority – defines the order in which rules are executed. Every rule has a priority number assigned.Action – defines what actions need to be taken when the client connection meets the condition.Exception – identifies the client connection to which the rule should not apply.Condition – identifies the client connection to which the rule applies.The elements of Client Access RulesĪ single Client Access Rule consist of the following elements: To get more information about Client Access Rules, visit this Microsoft document. (the last option seems to be reserved for Exchange Online, for the moment). With the use of more advanced rules, you can also block elements like authentication protocols, selected users in Active Directory or users having specified attributes in AD like e.g. The Client Access Rules feature allows you to block: There is no GUI you can use to manage them. Managing Client Access Rules is possible only from the Exchange Management Shell level. This functionality was not present in previous versions of Exchange and now it is a security milestone for small organizations, which cannot afford solutions like firewall operating at OSI layer 7 (application layer) to restrict access from the outside of the organization. It allows the administrator to define rules to block or limit access to EAC (former ECP) and to EMS (Exchange Management Shell). One of the most interesting security options in Exchange 2019 is the Client Access Rules feature.
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