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Connection problems when attempting outbound connections from EFT Server using SFTP.

Karla Marsh
EFT Express (SMB) & Enterprise

THE INFORMATION IN THIS ARTICLE APPLIES TO:

  • EFT Server, v6.4.0 and later

SYMPTOM

Connection problems when attempting outbound connections from EFT Server using SFTP.

RESOLUTION

Add the DWORD values below in the following location:

64 bit: HKEY_LOCAL_MACHINE\Software\Wow6432Node\GlobalSCAPE Inc.\EFT Server 4.0\

32-bit: HKEY_LOCAL_MACHINE\Software\GlobalSCAPE Inc.\EFT Server 4.0\

  • Create the DWORD WaitForServerVersion and specify a value:
  •      0 (disabled; the default) or 1 (enabled)

  • Create the DWORD DelayBeforeVersionString and specify a value:
  •      x <= 0 (disabled; the default), x >= 1 (delay in milliseconds)

MORE INFORMATION

If a client (EFT Server) sends the SSH version message too quickly, some SSH (SFTP) servers get their state machine confused, and they advance to the KEX INIT message even though they have not yet sent their SSH version message. When viewing the connection via Wire Shark, you don't see an SSH Version message from the remote SFTP server. Instead you see EFT Server connect and then immediately send its SSH version message. The remote server then replies with KEX INIT instead of SSH version. The registry entries above slow down the EFT Server client, causing it to wait for the server to send its SSH version message.

Details
Last Modified: 8 Years Ago
Last Modified By: GlobalSCAPE 5
Type: FIX
Rated 1 star based on 3 votes.
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