BIG-IP methods to Fix the “421 Misdirected Request” Error

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For those of us that are using the BIG-IP as a reverse proxy to front our internal websites to the world, the recent update to Apache has slapped a big “misdirected request” error across our shop windows.

The fix is that apache is looking for the SNI headers (that’s different from the HTTP headers I originally was working with).  The solution to this, for us anyway, was published ages ago in the thread: Serverside SNI injection iRule | DevCentral

Drop that in your iRule and the world starts working again.

Peace, Love and chocolate biscuits all round.

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Thanks for dropping this use-case / solution pairing @Pete_A .
Happy to hear that  @Kai_Wilke 's codeshare still has legs.

(I’ll further drop the link you provided in a comment associated with you and mark as solution - if you disagree for some reason let me know.)

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Serverside SNI injection iRule | DevCentral - solved the “421 Misdirected Request” error when using BIG-IP as a reverse proxy…

(Admin note: adding this explicitly as a comment for @Pete_A and marking as Solution - to increase likelihood of finding.)

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Hi,

It’s usefull Thank you for you sharing.
I use it to fix http status 421 after Apache2 update.

Well done !