Bug ID 503319: After network access is established browser sometimes receives truncated proxy.pac file

Last Modified: Apr 10, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP APM(all modules)

Known Affected Versions:
11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.2, 11.5.2 HF1, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.3, 11.4.1 HF9

Opened: Jan 27, 2015
Severity: 3-Major
Related AskF5 Article:


On MAC OSX platform, After network access is established, poxy.pac received by the browser is truncated.


Large proxy.pac file might not be downloaded or might be truncated.


This occurs if proxy.pac file is larger than 65535 bytes (~65 KB).


Reduce proxy.pac file size so that merge file is less than ~65 KB.

Fix Information

Merged (by F5 tunnel server) proxy.pac is now NOT truncated when sent to the browser even if its size is greater than ~65 KB.

Behavior Change