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<p>Users can&#8217;t access their mailboxes from anywhere as they get the error in the screenshot.</p>
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<p><strong>Related errors are 3002, 3005</strong></p>



<p>Event code: 3005</p>



<p>Event message: An unhandled exception has occurred.</p>



<p>Event time: 7/29/2015 11:10:57 AM</p>



<p>Event time (UTC): 7/29/2015 8:10:57 AM</p>



<p>Event ID: 6f94ea40e3964fb1a05d9fc48ffb4299</p>



<p>Event sequence: 38</p>



<p>Event occurrence: 2</p>



<p>Event detail code: 0</p>



<p>Application information:</p>



<p>Application domain: /LM/W3SVC/1/ROOT/owa-2-130826309519814020</p>



<p>Trust level: Full</p>



<p>Application Virtual Path: /owa</p>



<p>Application Path: C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\owa\</p>



<p>Machine name: EX2K1301</p>



<p>Process information:</p>



<p>Process ID: 19348</p>



<p>Process name: w3wp.exe</p>



<p>Account name: NT AUTHORITY\SYSTEM</p>



<p>Exception information:</p>



<p>Exception type: NullReferenceException</p>



<p>Exception message: Object reference not set to an instance of an object.</p>



<p>at Microsoft.Exchange.Clients.Common.UserAgent.HasString(String str)</p>



<p>at Microsoft.Exchange.Clients.Common.UserAgent.get_Layout()</p>



<p>at Microsoft.Exchange.Clients.Common.UserAgent.get_LayoutString()</p>



<p>at ASP.auth_logon_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer)</p>



<p>at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)</p>



<p>at System.Web.UI.Page.Render(HtmlTextWriter writer)</p>
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<p>at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)</p>



<p>at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)</p>



<p>Request information:</p>



<p>Request URL: <a href="https://www.google.com/url?q=https%3A%2F%2Fmail.domain.com%2Fowa%2Fauth%2Flogon.aspx%3Furl%3Dhttps%3A%2F%2Fmail.Domain.com%2Fowa%2FPowerShell-LiveID%26reason%3D0&;sa=D&;sntz=1&;usg=AFQjCNEBWBTx4wiDFVrmZ_0w8wQKCCaRDA" target="_blank" rel="noreferrer noopener">https://mail.Domain.com:443/owa/auth/logon.aspx?url=https://mail.Domain.com/owa/PowerShell-LiveID&;reason=0</a></p>



<p>Request path: /owa/auth/logon.aspx</p>



<p>User host address: 10.16.0.172</p>



<p>User:</p>



<p>Is authenticated: False</p>



<p>Authentication Type:</p>



<p>Thread account name: NT AUTHORITY\SYSTEM</p>



<p>Thread information:</p>



<p>Thread ID: 67</p>



<p>Thread account name: NT AUTHORITY\SYSTEM</p>



<p>Is impersonating: False</p>



<p>Stack trace: at Microsoft.Exchange.Clients.Common.UserAgent.HasString(String str)</p>



<p>at Microsoft.Exchange.Clients.Common.UserAgent.get_Layout()</p>



<p>at Microsoft.Exchange.Clients.Common.UserAgent.get_LayoutString()</p>



<p>at ASP.auth_logon_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer)</p>



<p>at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)</p>



<p>at System.Web.UI.Page.Render(HtmlTextWriter writer)</p>



<p>at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)</p>



<p>at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)</p>



<p>Custom event details:</p>



<p><strong>OWA PAGE</strong></p>



<p></p>



<figure class="wp-block-image size-large"><img src="https://www.moh10ly.com/wp-content/uploads/2021/03/exchange20132.jpg" alt="" class="wp-image-5820"/> 

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</figure>



<figure class="wp-block-image size-large"><img src="https://www.moh10ly.com/wp-content/uploads/2021/03/4339592.png" alt="" class="wp-image-5819"/></figure>



<p>Solution:</p>



<p>On Exchange servers, Make sure that Exchange servers are not members of Organization Management group and if they are then remove them and run this cmdlet anyway on all Exchange Servers then restart the Servers.</p>



<p><strong>Get-ClientAccessServer | Add-ADPermission -AccessRights ExtendedRight -ExtendedRights &#8220;ms-Exch-EPI-Token-Serialization&#8221;, &#8220;ms-Exch-EPI-Impersonation&#8221; -User (Exchange Server name)</strong></p>
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<p>Make sure you restart Exchange servers after you apply these cmdlet</p>

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