FileZilla is the only program that won't resolve DNS name

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gwduvalljr
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FileZilla is the only program that won't resolve DNS name

#1 Post by gwduvalljr » 2018-12-27 15:34

I have read many topics on the board, but none quite the same and none provided any solution that worked for me.

All on the same Windows 10 laptop:
- Using WinSCP & PuTTY I can both SFTP and SSH (both on port 22) to my server using the server's name.
- With FileZilla if I use the server's name all I get is "Connection timed out after 20 seconds of inactivity"
- With FileZilla if all I change is the server name to its IP, it works.
- No matter the DNS server I ask (using nslookup) they all report the correct IP address (so far I have asked all my local DNS servers as well as Google's DNS servers)
- I have "allowed" FileZilla through the firewall, but that seems like overkill since all the other programs work fine.

From everything I can tell this problem is specific to FileZilla and is specific to DNS lookup, but I have no idea how to determine why it has a problem when no other related programs have any issue at all.

Does anyone have any thoughts?

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Re: FileZilla is the only program that won't resolve DNS name

#2 Post by botg » 2018-12-27 17:51

What is the full hostname you have entered?

gwduvalljr
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Re: FileZilla is the only program that won't resolve DNS name

#3 Post by gwduvalljr » 2018-12-28 00:56

sftp.practiceadmin.com

Oh, I forgot to mention that there are many users of this hostname around the US.

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Re: FileZilla is the only program that won't resolve DNS name

#4 Post by botg » 2018-12-29 18:48

Please open cmd.exe and type the following command:

Code: Select all

ipconfig /all | findstr /R "DNS.Server"
What does it output?

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Re: FileZilla is the only program that won't resolve DNS name

#5 Post by gwduvalljr » 2019-01-02 12:38

Below is the output. I took it one step further and asked each of those DNS servers to lookup that DNS name.


C:\Users\gduvall>ipconfig /all | findstr /R "DNS.Server"
DNS Servers . . . . . . . . . . . : 10.32.5.111
DNS Servers . . . . . . . . . . . : 192.168.86.1

C:\Users\gduvall>nslookup sftp.practiceadmin.com 10.32.5.111
Server: pa-nor-dc02.practiceadmin.local
Address: 10.32.5.111

Name: sftp.practiceadmin.com
Address: 40.70.208.134


C:\Users\gduvall>nslookup sftp.practiceadmin.com 192.168.86.1
Server: testwifi.here
Address: 192.168.86.1

Non-authoritative answer:
Name: sftp.practiceadmin.com
Address: 40.70.208.134

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Re: FileZilla is the only program that won't resolve DNS name

#6 Post by botg » 2019-01-02 20:33

The SFTP support in FileZilla is based on PuTTY's psftp, DNS resolution works the same in both.

My best guess is that some third party program is partially blocking FileZilla's fzsftp component.

gwduvalljr
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Re: FileZilla is the only program that won't resolve DNS name

#7 Post by gwduvalljr » 2019-01-02 23:38

You are correct psftp has the same issue as FileZilla. Weirdly, PuTTY itself is fine and dandy with the domain name. Since I have no ideas how to make it work, I will just use WinSCP.

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boco
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Re: FileZilla is the only program that won't resolve DNS name

#8 Post by boco » 2019-01-03 02:02

Strange, resolves fine from here.

Code: Select all

02:50:30	Status:	Connecting to sftp.practiceadmin.com...
02:50:30	Response:	fzSftp started, protocol_version=8
02:50:30	Command:	open "anonymous@sftp.practiceadmin.com" 22
02:50:30	Trace:	Connecting to 40.70.208.134 port 22
02:50:30	Trace:	We claim version: SSH-2.0-FileZilla_3.39.0
02:50:30	Trace:	Server version: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.6
02:50:30	Trace:	Using SSH protocol version 2
02:50:31	Trace:	Server supports delayed compression; will try this later
02:50:31	Trace:	Doing ECDH key exchange with curve Curve25519 and hash SHA-256
02:50:31	Trace:	Server also has ecdsa-sha2-nistp256/ssh-rsa host keys, but we don't know any of them
02:50:31	Trace:	Host key fingerprint is:
02:50:31	Trace:	ssh-ed25519 256 93:ff:35:2a:6a:2f:1d:d8:b4:c0:5b:10:2a:dd:63:55 8mIePYhbS3awsiylS3iX01s9vXesytnWigZ6Abmb/NI=
02:50:31	Command:	Trust new Hostkey: Once
02:50:31	Trace:	Initialised AES-256 GCM client->server encryption
02:50:31	Trace:	Initialised AES256 GCM client->server MAC algorithm (in ETM mode) (required by cipher)
02:50:31	Trace:	Initialised AES-256 GCM server->client encryption
02:50:31	Trace:	Initialised AES256 GCM server->client MAC algorithm (in ETM mode) (required by cipher)
02:50:31	Command:	Pass: *********************
02:50:31	Trace:	Sent password
02:50:33	Trace:	Password authentication failed
02:50:33	Error:	Authentication failed.
02:50:33	Error:	Critical error: Could not connect to server
Error is because of missing login creds, but it connects fine.
### BEGIN SIGNATURE BLOCK ###
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FTP connection problems? Do yourself a favor and read Network Configuration.
All FileZilla products fully support IPv6. http://worldipv6launch.org
### END SIGNATURE BLOCK ###

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Re: FileZilla is the only program that won't resolve DNS name

#9 Post by botg » 2019-01-03 08:56

Do you by chance have a stored session in PuTTY named after the hostname?

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Re: FileZilla is the only program that won't resolve DNS name

#10 Post by gwduvalljr » 2019-01-03 13:32

Why yes I did and it was associated with the old IP. I removed that stored session and now FileZilla works.

Thank you very much. I would never have thought that the stored session had any connection to FileZilla. Now, I know and that will help me debug any other issues I happen across.

Thank you again!

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Re: FileZilla is the only program that won't resolve DNS name

#11 Post by boco » 2019-01-03 22:17

FileZilla automatically uses the sessions stored in PuTTY/Pageant.
### BEGIN SIGNATURE BLOCK ###
No support requests per PM! You will NOT get any reply!!!
FTP connection problems? Do yourself a favor and read Network Configuration.
All FileZilla products fully support IPv6. http://worldipv6launch.org
### END SIGNATURE BLOCK ###

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