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Article 2782

425 Unable to build data connection: TLS session of data connection not resumed.

Problem

When connecting to FileZilla Server 1.x the following error is logged:
425 Unable to build data connection: TLS session of data connection not resumed.

Cause

This issue is caused by the lack of TLS 1.3 session resumption support in Schannel.
TLS 1.3 Session resumption

Workaround

Install the latest version of SmartFTP.

Keywords
TLS filezilla

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