Teamcity - FTP upload failed with error “425 Cannot open data connection”

Question

I am using Teamcity to deploy my Web App in FTP. The deployment worked very well until Monday. Now it doesn't work anymore. I didn't make any changes on Teamcity. The problem: FTP transfer starts normally. Some files are transferred. Then it interrupts with an FTP error:' 425 Cannot open data connection'. The FTP deployment works fine on all my other Web Apps. Can you give me a hint about this problem? teamcity step configuration

Logs :

[13:57:10]i: [Step 1/1] < 257 "/" is current directory.

[13:57:10]i: [Step 1/1] > PASV

[13:57:10]i: [Step 1/1] < 227 Entering Passive Mode (104,40,210,230,39,137).

[13:57:10]i: [Step 1/1] > NLST

[13:57:10]i: [Step 1/1] < 125 Data connection already open; Transfer starting.

[13:57:10]i: [Step 1/1] < 226 Transfer complete.

[13:57:10]i: [Step 1/1] > CWD site

[13:57:10]i: [Step 1/1] < 250 CWD command successful.

[13:57:10]i: [Step 1/1] > PASV

[13:57:10]i: [Step 1/1] < 425 Cannot open data connection.

[13:57:10]E: [Step 1/1] Failed to upload artifacts via FTP. Reply was: 425 Cannot open data connection.

[13:57:10]E: [Step 1/1] Step Deploy (FTP Upload) failed [13:57:10] : Publishing internal artifacts [13:57:10] : [Publishing internal artifacts] Publishing 1 file using [ArtifactsCachePublisher]: [13:57:10] : [Publishing internal artifacts] Publishing 1 file using [WebPublisher]: [13:57:10]E: Unknown build problem reported on agent [13:57:10] : Build finished

Answer 1

Firewall issue me think.

FTP actually transfers using a random port, you can however tell it to use a random port from a range eg 9100-9200.

It only uses port 21 for listing.