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- EDB Recovery and MigrationRecover EDB to PST, EDB to Office 365 and Exchange NO Duplicate Migration
- OST Recovery and MigrationRecover OST to PST, OST to Office 365 and Exchange Migration
- PST Recovery and MigrationRecover Outlook PST, PST to Office 365 and Exchange Migration
- MBOX Export and MigrationExport MBOX to PST, MBOX to Office 365 and Exchange Migration
- NSF Export and MigrationExport NSF to PST, NSF to Office 365 and Exchange Migration
Exchange and Office 365 Migration
- Exchange Server MigrationMigrate Exchange 2007, 2010, 2013, 2016, 2019 to Office 365 tenants. Also, migrate between Exchange servers and PST
- Office 365 MigrationMigrate Source Office 365 tenants to Destination Office 365 tenants. Also, migrate to Exchange Server and PST
- IMAP Email Backup & MigrationMigrate all IMAP email servers (Gmail, Zimbra, Zoho, Yahoo etc.), Office 365, Exchange and Backup to Outlook PST
- SharePoint Online MigrationMigrate documents, files and folders from SharePoint sites
- OneDrive for Business MigrationMigrate documents, files and folders from OneDrive
- Microsoft Teams MigrationMigrate Teams, documents, files and folders etc.
Exchange and Office 365 Backup
- Office 365 BackupIncremental, Granular, Encrypted and Compressed Office 365 Mailboxes Backup
- Exchange Server BackupIncremental, Granular, Encrypted and Compressed Exchange Mailboxes Backup
- SharePoint, OneDrive & Teams BackupBackup Online site collections, Team sites, Office 365 groups, all documents etc.
- Duplicate Remover - Office 365 & Exchange Remove duplicate emails, calendars, contacts, journal etc. from Office 365 and Exchange
- GAL and All Address Lists migrationDirectly migrate Exchange and Office 365 Global address list and Address Lists items
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Blog » Migration and Throttling Management » The underlying connection was closed

The underlying connection was closed

Problem

This error may occur due to various reasons; one among them may be due to large items migration. Migration of those items need more time and there is a chance of destination connection being closed.

Solution

If you are authorized to control the server configurations

Add bigger value to the connection timeout for incoming data transfers (Refer the below image for IIS. Set the value greater than 120).
Increase the size limit which can be framed through the API.

To change the timeout value:

Open the IIS manager (run -> inetmgr.exe).
Browse the default website or the Exchange website on the left side pane.
Right-click on Manage Website, then select Advanced Settings, expand limits. Increase the Connection Time-out for wich the default value is set to 120 seconds.

Try to perform migration again.

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