Intermittent Connection Timeouts During Bulk File Transfers in Dreamweaver FTP/SFTP

When performing bulk file transfers via Dreamweaver’s Site > Servers FTP or SFTP connection, users occasionally see “Connection timed out” or “Unable to connect to server” errors even though network connectivity and credentials are correct.

The underlying connection pool that Dreamweaver maintains per site is not exposed in the UI, and its default size (reportedly around five simultaneous connections) varies across CC releases. It is unclear whether excess connection requests are queued until a slot frees or are rejected immediately, making it difficult to confirm when the pool limit is the root cause of intermittent failures.

What is the exact simultaneous connection limit for FTP/SFTP sites in Dreamweaver CC 2015‑2021? Does Dreamweaver queue excess connection attempts or return an immediate error when the pool is exhausted? How can administrators verify that the internal pool limit has been reached without altering timing through verbose logging?