TWSD-1337 FTPS Upload Fails with “553 Could Not Create File”, Eventually Exhausting Port Numbers

Review Request #1175 — Created Nov. 18, 2025 and submitted — Latest diff uploaded

Information
weikai
APV10
rel_apv_10_7, rel_apv_10_7_3, rel_apv_10_7_4,rel_apv_10_7_3_26_HSOL,rel_apv_10_7_3_29_HSOL
TWSD-1337
1154
Reviewers
kevin.poh, mingji, peteryeh 
Root cause:

When the APV actively sends out an RST, it does not block the L7 application firewall.


Solution:

Complete the missing cases.
Reproduce:

1. The VS port range is limited, for example a minimum range of 20 ports.

2. Upload two or more files at once using CoreFTP.

Incorrect file permissions on the FTP server, such as attempting to upload and overwrite a file without write access. Error: “553 Could not create file.”

3. The issue accumulates over time and eventually gets triggered.

Error: “425 insuffioent ports please try again later“
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