Suddenly unable to use gpg-agent with putty

[Dylan Wang]

Putty gives me disconnected no supported authentication methods error, and
not asking me for pinentry pin, but I could do git sign without problem. I
didn't change server settings all my server can't ssh with putty now, and I
double check sshcontrol file, it doesn't change and correctly configured,
also enable-putty-support is in my gpg-agent.conf. I tried everything I
could do, re-plug my keys, reboot, reinstall & configure gnupg, restart
gpg-agent...my settings always works well on the past few months. Right now
I completely can't figure out what's happened here, I'm running gpg 2.1.14
on windows 10, below are the detailed log for gpg-agent:

λ gpg-agent --daemon --verbose --debug-level guru --enable-putty-support
gpg-agent[12792]: enabled debug flags: command mpi crypto memory cache
memstat hashing ipc
gpg-agent[12792]: listening on socket
'C:\Users\goncc\AppData\Roaming\gnupg\S.gpg-agent'
gpg-agent[12792]: gpg-agent (GnuPG) 2.1.14 started
gpg-agent[12792]: putty message loop thread started
gpg-agent[12792]: handler 0x4 for fd 496 started
gpg-agent[12792]: DBG: chan_0x000001f0 -> OK Pleased to meet you
gpg-agent[12792]: DBG: chan_0x00000270 <- OK Pleased to meet you
gpg-agent[12792]: DBG: chan_0x00000270 -> GETINFO pid
gpg-agent[12792]: DBG: chan_0x000001f0 <- GETINFO pid
gpg-agent[12792]: DBG: chan_0x000001f0 -> D 12792
gpg-agent[12792]: DBG: chan_0x00000270 <- D 12792
gpg-agent[12792]: DBG: chan_0x000001f0 -> OK
gpg-agent[12792]: DBG: chan_0x00000270 <- OK
gpg-agent[12792]: DBG: chan_0x00000270 -> BYE
gpg-agent[12792]: DBG: chan_0x000001f0 <- BYE
gpg-agent[12792]: DBG: chan_0x000001f0 -> OK closing connection
gpg-agent[12792]: handler 0x4 for fd 496 terminated

Much appreciate if someone could help me or give me some advice on how to
debug this.

Thanks,
Dylan
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