Serv-u Ftp Server Download Full

Serv-U FTP Server and Serv-U MFT Server both support file transfers using FTP and FTPS, allow for the exchange of multiple and large files, and the monitoring of FTP server logs to identify issues for troubleshooting and error-handling. However, many IT administrators switch from Serv-U FTP Server to Serv-U MFT Server as they scale their IT environment and their document sharing policies grow more complex. Further, dependent on their needs for data security and compliance, businesses will choose Serv-U MFT as it enable data transfers using SFTP and HTTP/S, and provides FIPS 140-2 compliant encryption.

The SolarWinds Serv-U File Server (Serv-U) is a multi-protocol file server capable of sending and receiving files from other networked computers through various means. Serv-U comes in two editions: Serv-U FTP and Serv-U MFT, as described here.

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It sounds like something it trying to interfere with the serv-u gateway communication. You might try if you can connect on that port locally (on the gateway machine itself). See if the connection gets dropped there as well. If it does, look at the gateway machine- does it have more than one fire wall? Does it have anti virus or anti malware that is preventing the connection?

They also have no idea as to why this is happening and sent the case information to the development team. I had installed wireshark on both machines and found that the request was getting to the DMZ machine, however it never completes the handshake, instead of a FIN, it does a RST and resets the connection. it looks to me like a windows security measure of some sort. Just to be sure, I spun up a Windows server 2008 standard and installed the gateway software and tried that with the same results. lets see what support comes up with. I need to get this running today, I may have to bail on the gateway and just go directly to the MFT.

myName.crt The self-signed certificate file. This can be used immediately on the server but is not authenticated by any known certificate authority. myName.csr The certificate request file. This can be provided to a certificate authority for authentication. myName.key The private key file. This is used to secure both certificate files. It is extremely important that you keep the private key in a safe and secure location. If your private key is compromised, your certificate can be used by malicious individuals.

Since upgrading to Serv-U 15.3.2, I have many users who cannot connect anymore.

In my case, the similarity with all the cases is that they are using an application that uses the very popular JSch SFTP library within it to connect to external SFTP servers to upload/download files.

This has worked fine for over 10+ years but none of these users can now connect to Serv-U at all, which is causing major problems.

I originally discussed the problem with jeffpahf in a separate thread as he was having issues with some users and we thought it was key related initially, but it is not. I have created this specific thread for the issue as many users of Serv-U 15.3.2 are affected by this issue and will probably be Googling for it.

Solarwinds have released an FAQ and acknoledge this issue in 15.3.2 which can be seen here. This also affects Maverick Legacy Client and Cisco Unified Backup, as well as some older OpenSSH clients.

In summary, the cause is that some client software passes its "name" and version number to Serv-U in a format that isn't straictly compliant with the SFTP RFC, mainly because these libraries do not pass the invisible CR (carriage return) symbol to the end of their name and version number. From what I have observed, this makes Serv-U just continually wait at the point the connection is opened and then the connection times out. Therefore, zero connections can now be made from these clients or any clients/software that uses libraries such as JSch.

Whilst I understand that the RFC compliance is useful, in this case it literally stops software that has worked for 10+ years from making any connections, ever.

In my opinion, because Serv-U has alloed these connections (like most other SFTP servers) since it was created (decades ago), it needs to have backward compatability for the systems that integrate with it.

I would like to respond to each suggestion in the Solarwinds KB to demonstrate why there needs to be a long term solution..

Responses to KB suggested solutions

Suggestion 1: Reach out to your application team to add a CR symbol in your Java-Based client code and ensure that the program is RFC compliant.

Response 1: In 99% of cases this is not possible. Automation software and long established applications use the latest JSch library and it cannot be changed as it is an integrated part of the application.

Suggestion 2. Use a different application that is RFC compliant

Response 2: For the same reasons as Respose 1, most of the time these libraries are integrated into software and have been for 10+ years

Suggestion 3. Rollback to the previous version of Serv-U either by reverting to your Serv-U server snapshot backup, or by following this article.

Response 3: This may be possible as a temporary fix but 1) it is messy due to the Server Identity changes in 15.3.2 and 2) It is not a long term solution, the servers will eventually need to be upgraded. If you are stuck and urgently need to roll back, the article is here but I am a little skeptical it will work due to the Server Identity changes made in 15.3.2 which are detailed toward the end of that article.

Impact

I've already seen others having this issue and can observe how hundreds of users using all different systems will not be able to connect or use Serv-U on 15.3.2. These systems have connected to Serv-U for 10+ years and they cannot just stop - many are automated processes and custom software that users cannot control.

Also, had another differernt user not able to connect prior to the fix and they were using Sun_SSH_2.4 client, just connecting from their Sun server natively with the sftp command line. The Buddy Drop fixed it for them too.

Updating all Components in one step seems risky in my opinion. Any usefull logs in the database-server?

Can the new application-server connect to the old database-server?

best regards,

Markus

I have a few Serv-U setups running, and some of them are using external smb shares like NAS or windows file shares requiring authentication.

My Serv-U servers are not domain joined and my serv-u services are running as a local service account on the server. My storage solutions are often domain joined or at least using ldap for authentication users requiring me to use a domain account to access the share.

If i'm on the server trying to access the share i get prompt for user/pw. After user/pw input i can access the share.

Using the same logic I'm able to add the share as a persistent disk or even add my credentials using cmdkey as the same user running serv-u service. This allows me to access the share in windows, however wont have any effect in Serv-U it seems.

Going into Serv-U Management - Adding the share as a directory, entering user/pw/domain should have given me the same behaviour. However it seems this have no effect.

Adding the share as homedirectory on one of my users, or as a addon directory using virtual directory gives me an error that the directory does not exist or no error just not showing up in the list as all.

The same goes for domain directory rules adding the share with user/pw/domain with no effect

I'm guessing had I had my server and NAS joined to the same domain and had my services run as the same user having access to the share this would work. However this is not an option.

Using the method above seem to have worked on previous versions of Serv-U Version 15.2 (15.2.3.742) and older. I'm currently on 15.4 and had the same issue on 15.3.

Errors:

To specifically advise based on your issue with the Window Server 2008 R2 Windows Firewall ports, it appears that Serv-U support "Auto-configure firewall through UPnP" (copied below) for opening up necessary ports at the OS server level, so for the simplest solution, you may want to utilize this.

When enabled, Serv-U automatically configures the necessary port forwards in your UPnP-enabled network device (usually a router) so that the file server is accessible from outside your network. This is particularly useful in enabling PASV mode FTP data transfers.

As far as "domains" are concerned from a Serv-U perspective, I see many references in the vendors admin guide (link above) suggesting that certain "secure" protocol settings, etc. set at the "server" level which "domains" inherit. So in this context, I wouldn't think whether domains are setup or not would affect being able to connect to the server for whichever protocol you configure.

If you're testing this server software in a "demo" mode, etc. it wouldn't hurt to reach out to technical support and ask them since they'd know best and most accurately since this is their product which they develop, maintain, and support. This way you also get a sense of what type of technical support they will provide once you have this being used for "production" purposes.

From the outside world, you may need to setup public DNS pointers and route that to a public IP address (internal server(s)) and ensure you NAT or port-forward this to your internal server IP address(es) for the server(s) that are listening for traffic on those ports.

(Below are the various "standard" FTP, FTPS, and SFTP protocol port ranges used for the communications you elect to use. You'll need to ensure that these ports are accessible from the inside network routers and firewalls as well as outside network routers and firewall coming into your data network to communicate with the server (the server OS firewall as well).) e24fc04721