After upgrading Exchange server to the latest patch or CU, you found the error page after login to ECP or OWA. OWA will be showing a login screen that says ‘bad request’ after entering credentials and ECP will be showing “Could not load file or assembly ‘Microsoft.Exchange.Common, Version=15.0.0.0 …” Resolution 1. Open IIS Manager. Expand … Read more
Today, I run the maintenance to upgrade the Exchange Server 2013 from CU 20 to CU 23. However, I got the error on step 14 that says “Microsoft.Exchange.Data.Common.LocalizedException: Couldn’t resolve the user or group”. I checked and confirmed the user/group is already in Active Directory. Below is the full detail of the error. As you … Read more
When you send an email to a recipient, you get IMCEAEX NDR that said “Remote Server returned ‘550 5.1.11 RESOLVER.ADR.ExRecipNotFound; Recipient not found by Exchange Legacy encapsulated email address lookup’”. This issue is happening when you migrate a mailbox with no direct path. Resolution You need to create an X500 email address alias and set … Read more