![]() ![]() Migrating from Google Photos to an ASUSTOR NASĢ. ![]() Home users / Content Creators Home & SOHO For Apple Users Gaming and Live Stream Best Nas for Photographers Roon Server ASUSTOR and Plex Media Server Adobe Video and Audio Solutions Video Editing with an ASUSTOR NAS.Applications 10 Tips for Business Comprehensive Backup Solutions Wake on Wan Remote Work Docker Ransomware Fighting Tool.Features Simplified Management Storage Management File Management & Sharing Backup & Restore System & Data Security Server Hosting Access Control Easy Connect Virtualization Solutions Optimized Performance Home Entertainment Energy Efficiency.NAS Buying Guide What is a NAS? Why ASUSTOR NAS? What is ADM Overview Latest Version NAS Apps What is App Central App Central Featured 3rd Party Apps Try Now Live Demo.Server signature is not valid.Ģ0:09:19.075 Error Info: : Server signature is not valid.Īt nixw.ucjt(SshSession fbu, Byte fbv, Byte fbw, Byte fbx, Byte fby, nixj& fbz, Byte& fca, SshPublicKey& fcb)Īt .psov(htgm amh, Boolean ami)Īt. I tried connecting to :22 using SftpWinFormClient sample with default settings and it is still failing:Ģ0:09:18.640 Info Info: Connecting to :22 using Sftp.Ģ0:09:18.648 Info Info: Assembly: Rebex.Sftp 2020 R1 for. Our customer who originally reported this issue in September 2019 informed us that they are going to ask their customers to report it as well, but apparently the problem still persists as of February 2020. We strongly recommend reporting this issue to Strato so they can fix it. Rebex SFTP uses rsa-sha2-256 by default (and runs into an issue because the server’s implementation is broken).This means that the following ciphers are negotiated: Rebex SFTP: server at claims to support the following ciphers:.Interestingly, common SFTP/SSH clients such as WinSCP, FileZilla and PuTTY’s psftp do not support RFC 8332 and the rsa-sha2-256 cipher yet, which means that they are not affected by this server-side issue.ĭisabling rsa-sha2-256 (and rsa-sha2-512 which is also not working properly at Strato’s server) in Rebex SFTP makes it connect successfully as well: var client = new Sftp() Ĭ("ssh-rsa", "ssh-dss", "x509v3-sign-rsa", "x509v3-sign-dss", "ecdsa-sha2-nistp256") Ĭlient.LogWriter = new ConsoleLogWriter(LogLevel.Debug) įor the sake of completeness, these are lists of supported host key ciphers of WinSCP, FileZilla (as of ) and Rebex SFTP (with default settings), in order of preference: ![]() Therefore, Rebex SFTP client rejects this mismatched signature, which is correct behavior. This cipher is supposed to use SHA-256 hash algorithm for its RSA signature (see RFC 8332), but the signature received from Strato's server is actually a signature based on SHA-1. For this workaround and my solution Im using my existing external SFTP Storage from a german company Strato (Product 'HiDrive). There is something wrong with Strato server’s implementations of rsa-sha2-256 host key cipher. Community, for my case Ive been looking for a workaround to bring out my backup data weekly without creating a new pbs server remotly. SshException.ProtocolMessage is "KeyExchangeFailed"īut this leaves me with a bad gut feeling as it seems to rely on internal implementation details which might change with new Rebex releases.Īny suggestions on this would be appreciated!.SshException.Status is SshExceptionStatus.OperationFailure.SftpException.Code is SftpErrorCode.UnknownError.If it matches the criteria below, try again with preferred = DSS.Try to connect with the default (preferred = RSA).When trying to connect to a popular German cloud storage provider via SFTP (STRATO HiDrive), an SSH key exchange failure exception occurs.Ĭhanging the PreferredHostKeyAlgorithm from RSA (which seems to be the new default since 2019 R1) "back" to DSS helps and the connection attempt succeeds, but I don't want to hard code it into my application and I want to avoid making this configurable. ![]()
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