Zimbra Migration: Request Not Allowed On Port
Configure the correct IMAP port (143 or 993) for Zimbra connection.
Last updated: 2025-01-15 Troubleshooting
Error Message
Zimbra Migration Error
System failure: Request not allowed on port [port]
This error indicates an incorrect port configuration in the migration settings.
Wrong Port Configuration
🔌
Migration Tool
Wrong port
→
🚫
Zimbra Server
Port rejected
→
❌
Connection
Not allowed
Root Cause
Incorrect Port Configuration
The Zimbra server rejects Cloudiway's connection requests because an incorrect port is configured in the migration platform. The server only accepts connections on specific IMAP ports.
Valid IMAP Ports
143
Standard IMAP
Unencrypted
993
Secure IMAP
SSL/TLS encrypted
Solution
Configure Correct Port
1
Open Zimbra Connector Settings
Navigate to your Zimbra source connector configuration in the Cloudiway platform.
2
Update Port Setting
Change the port to either 143 (standard IMAP) or 993 (secure IMAP with SSL).
3
Enable SSL if Using 993
If you choose port 993, ensure the SSL/TLS option is enabled in the connector settings.
4
Save and Restart Migration
Save the connector configuration and restart the migration process.
Use Port 993 for Security
We recommend using port 993 with SSL encryption for secure email
migration, especially when migrating over the internet.