# Problems connecting via SFTP to Solarwinds Serv-U servers

> Serv-U 15.3.2 changed its SSH protocol exchange, which blocks Cascade CMS. Apply hotfix 1 and allow non-RFC compliant exchange.

URL: https://www.hannonhill.com/cascadecms/latest/articles/content-authoring/publishing/problems-connecting-via-sftp-to-solarwinds-serv-u-servers.html
category: Content Authoring
article-type: troubleshooting
content-kind: faq
release-availability: all
tags: publishing, errors
updated: 2026-10-06

When attempting to publish via SFTP to a Solarwinds Serv-U 15.3.2 or later server, one or both of the following errors may appear in publish reports:

```bash
SFTP error: connection reset
SFTP error occurred during SFTP Shuttle initialization: Session.connect: java.io.IOException: End of IO Stream Read
```

These are the result of updates made in Serv-U 15.3.2 that prevent Cascade CMS from establishing an SFTP connection.

To correct it, follow **Resolution 1** of Solarwinds' article [SFTP connection not established for legacy Java clients](https://support.solarwinds.com/SuccessCenter/s/article/SFTP-connection-not-established-for-legacy-Java-clients?language=en_US). In summary, on the Serv-U server:

1. Apply the Serv-U 15.3.2 hotfix 1.
1. Enable **Allow non-RFC compliant SSH protocol version exchange**.