How to: fix a white-list or safe-list suddenly empty Server! version: 4.0.0-4.1.4

Occasionally users report that their white-list or safe-list in the web management interface suddenly shows up as “empty” and they cannot add any more IP addresses or networks to it. That bug was already previously documented in our knowledge base, and has been resolved/fixed as of version 4.1.5.

The misbehavior is caused by the fact that an Admin has added the same IP or network twice to the list(s).
Upgrading to the latest version will prevent Admins from adding any more duplicates… but it does not sanitize the existing lists, so you will still have to “clean” your lists manually before you can see them again. Continue reading Server! v4.0.28 released

We have just released version 4.0.28 of our Server! software. This version features the following improvements:

  • Fixed: bug in the DiskAES256 virtual file system (VFS) that caused WinSCP to raise an “Error 4: file-write error”

Note: if after the update you notice any unexpected behavior in the web interface, just hit Ctrl-F5 in your browser; that will force the browser to reload the page as well as all back-end scripts and update the ones that may have been cached from previous versions of the software.

As usual you can download this new release from our website.

Making Server! work with SSHFS/WebEx Server! version: 4.0.19+

SSHFS is a FUSE-based filesystem client for the SSH File Transfer Protocol (SFTP); it’s very common among Linux users to mount SFTP targets as local directories. WebEx is a well-known teamwork collaboration tool by Cisco that uses SSHFS to back-up its data to a remote SFTP server.

Unfortunately, the coupling of SSHFS/WebEx – at the time this article is being written – has at least two problems that can cause serious issues to servers that implement the SFTP protocol and its extensions correctly. Continue reading

Firewalls and FTP external IP address for PASV

Yesterday we came across what, at first, seemed to be a pretty odd case, and we think it’s worth sharing it with our users.

Most firewalls (we’d say all the ones we know) have NAT/PAT capabilities, and many are able to perform protocol-level inspection when the connection is not encrypted. SSH (and SFTP) are always encrypted, but FTP can be either encrypted or not; yet, theoretically protocol inspection should only prevent protocol-related attacks, not modify client requests or server responses.

Yet, yesterday a customer with a perfectly configured instance of Server! was experiencing a weird behavior: FTPS/FTPES (encrypted) sessions were working perfectly, while plain FTP sessions were dropped upon every attempt to open a data connection to transfer files. Continue reading

Maintenance release: Server! v3.1.6.46

We have just released Server! v3.1.6.46 to work around the issues caused by CloudBerry Backup, as discussed in this post.

The SFTP protocol standard states “The server will respond to this request with a SSH_FXP_STATUS message. If a file or directory with the specified path already exists, an error will be returned.”; Yet, CloudBerry Backup tries to create the same directory twice and when Server! correctly sends an error back the second time (because the directory already exists) CloudBerry Backup ( considers the backup job failed.

This new version of Server! tries to identify CloudBerry Backup, and sends a “success” reply upon double directory creation requests, but will practically ignore the second request if the first one was successful.

We have already contacted CloudBerry Lab, and we will remove this workaround from our software as soon as they release an update that fixes their protocol violation issue.

For now, if you need to use Server! together with CloudBerry Backup, you are advised to download the latest version of our server from our web site.

CloudBerry Backup and Server! Free (SFTP)

Some users reported the inability to perform backups from CloudBerry Backup to Server! Free Edition.

Therefore we have analyzed the situation, and this is what we have discovered:

  • By default CloudBerry Backup tries to use 5 (five) concurrent connections to your SFTP server
  • The free edition of Server! is limited to 3 (three) concurrent connections, and drops/cuts the 2 connections that exceed such limit

Since the number of concurrent connection cannot be changed in Server! Free (hey, after all, it’s a forever-free product for personal use only) then our recommendation is to set CloudBerry to perform 3 concurrent connections instead of 5. Continue reading

Mail server migration – sorry for any inconvenience!

Hello everybody,

after the 4th network outage in less than 2 months with our e-mail provider, we have decided that it was time for us to switch to a different service.

Since July 11, 2014 till July 15, 2014 we have experienced serious difficulties both sending and receiving e-mails. We know for sure that several recipients have not received the e-mails we sent them, and we suspect we’ve missed some of the messages that were sent to us in such time frame.

Therefore we beg your pardon and kindly ask you to bear with us while we complete the migration process (by the end of day, today, July 15, 2014) and then – please – resend us your e-mails if you haven’t received our reply.

We always reply. If you haven’t got a reply, please, check your spam folder. If our reply is not even in your spam folder, then it means we haven’t received your message.

Thank you for your patience.

Syncplify, Inc.