TWSD-1157 APV throwing an error "system is busy" in webui when we switch to Webui tab "DNS 64 settings" ||AS-25348||

Review Request #1150 — Created Nov. 12, 2025 and discarded — Latest diff uploaded

Information
lucille
APV10
rel_apv_10_7
TWSD-1157
Reviewers
austin, shuinvy, weikai 
To fix the 500 error for dns page.
    

  1. Reproduce the error by the step.
    2. 

  2. Find the page is controlled by python code.
    3. 

  3. Find the bug have complex multi-line regex failed to handle quoted service names.
    4. 

  4. Set default configuration protection and exception handling.
    5. 

  5. Add the fixed code to VM environment, and page render is correct.
    6.
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