The F1, F2, F3, and F4 function keys are not sending the correct escape sequences.
S60 PuTTY F2: ^[[12~
Xterm Spec: ^[OQ
My application relies on the F2 key to exit, so if I login to it I am not able to quit.
This isn't really a bug, but more a missing configuration option. PuTTY sends Esc[n~ -style function key and keyboard escape codes by default, and while PuTTY for Windows has a configuration option to change this to Xterm and other variants, PuTTY for Symbian OS doesn't.
I'll create a wishlist-item for adding this. In the mean time, you can try editing the config file by hand. This only works if you have installed PuTTY on a memory card (or have an AllFiles-capable file browser). To try to do this, find the relevant profile file under \private\f11f9070\profiles, and set