TWSD-1357 FTPS Upload Fails with “426 Failure writing network stream”

Review Request #1215 — Created Dec. 8, 2025 and submitted — Latest diff uploaded

Information
weikai
APV10
rel_apv_10_7, rel_apv_10_7_3, rel_apv_10_7_3_25_HSOL, rel_apv_10_7_3_26_HSOL, rel_apv_10_7_3_29_HSOL, rel_apv_10_7_4
Reviewers
kevin.poh, mingji, peteryeh 
TCP timeout setting command: system tune tcpidle <timeout>

FTP(S) SLB (Server Load Balancer) stops transmission when file download/upload exceeds the timeout.
The error "426 Failure writing network stream" occurs when the time reaches two times the timeout value.
The minimum value for the command system tune tcpidle <timeout> is 60 (seconds).
Testing the results usually takes 1-2 minutes.

Accelerating the Test
To speed up the test, you can modify the timeout directly as root. 
The example sets the value to 10 seconds (10000 milliseconds).
Note: Adjust this value based on your environment; setting it too short may cause timeouts even during login.
1. Log in with root privileges.
2. Execute the command: /ca/bin/u_sysctl net.inet.clicktcp.idle_timeout=10000

Requirement for Each Transfer:
- Each file transfer (upload or download) must exceed the configured timeout duration.

Test Procedure:
1. Upload a file 10 times.
2. Download a file 10 times.
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