Zimbra Migration: No Connection Error
Check firewall and security settings blocking the migration connection.
Error Message
Zimbra Migration Error
Fatal error during migration process: No connection could be made because the target machine actively refused it [ip-address]:[port]
This error occurs when the migration tool cannot establish a connection to the Zimbra server.
Connection Blocked
Root Cause
Security Measures Blocking Connection
The Zimbra server is rejecting the connection attempt. This typically occurs due to security measures like firewalls, server restrictions, or IP-based access controls blocking the migration tool's connection.
Common Blockers
- • Network firewall blocking incoming connections
- • Zimbra server firewall rules
- • IP whitelist not including Cloudiway servers
- • Port not open or listening
- • Network routing issues
Solution
Remove Security Restrictions
Check Firewall Rules
Verify that your network and server firewalls allow inbound connections on the required IMAP ports (143 or 993).
Whitelist Cloudiway IPs
If using IP whitelisting, add Cloudiway's migration server IP addresses to your allowed list.
Verify Server Accessibility
Test connectivity from an external location to ensure the Zimbra server is reachable on the internet.
Restart Migration
After removing the restrictions, restart the migration process.