Tag Archives: ASM

The IT Detective Agency: the case of Failed to convert character

Intro A user of a web form noticed any password that includes an accented character is rejected. He came to use as the operator of the web application firewall for a fix. More details The web server was behind an … Continue reading

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HTTP replay user-agent

Intro When debugging F5’s Web Application Firewall (AKA ASM) you get all the HTTP request headers in the GUI which you can cut and paste. Sometimes it is not so obvious how to fix a particular SupportID and you don’t … Continue reading

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Tipsheet: How to run NTP on F5 BigIP

If you feel you’ve added your ntp servers correctly via the GUI (System|Configuration|Device|NTP), and yet you get an output like this: # ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== ntp1.drj .INIT. 16 – – … Continue reading

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