> Yes, you're right. glibc was the problem. I tried to build an nginx deb
> package on a development machine with updated glibc libs and installed it
> on the production server.

Don't upgrade libc because of this (it will mess your system up).

Just define it manually when compiling nginx by passing it to the compiler:
-DTCP_FASTOPEN=23



Regards,

Lukas




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