I'm trying to set up nginx (stable and devel, both without success) as an IMAP proxy to an Exchange server.

The config is: daemon off; error_log /var/log/nginx-error.log debug; events { worker_connections 1024; } mail { auth_http 127.0.0.1:9000/cgi-bin/auth; imap_capabilities "IMAP4rev1" "UIDPLUS";

server { listen 143; protocol imap; proxy on; } }

I give back on TCP/9000 the following: HTTP/1.0 200 OK Auth-Status: OK Auth-Server: 127.0.0.1 Auth-Port: 1433 (this is just a test on a forwarded port)

What I get in the log: 2007/08/16 16:06:43 [info] 38634#0: *6 client connected to 2007/08/16 16:06:48 [error] 38634#0: *6 upstream sent invalid response: "LOGIN BAD Protocol Error: "Unknown command found"." while reading response from upstream, client: , server: , login: "", upstream:

If I trace nginx, I see the following IO: 38634 nginx GIO fd 8 read 103 bytes "* OK Microsoft Exchange Server 2003 IMAP4rev1 server version 6.5.7638.\ 1 (MAILSRV) ready.\r " 38634 nginx RET recvfrom 103/0x67 38634 nginx CALL sendto(0x8,0x3f1140,0xb,0,0,0) 38634 nginx GIO fd 8 wrote 11 bytes "LOGIN {6}\r " 38634 nginx RET sendto 11/0xb 38634 nginx CALL kevent(0x7,0x40c000,0,0x414000,0x200,0x7fdffffe3b0) 38634 nginx RET kevent 2 38634 nginx CALL gettimeofday(0x7fdffffe250,0) 38634 nginx RET gettimeofday 0 38634 nginx CALL recvfrom(0x8,0x47c000,0x2000,0,0,0) 38634 nginx GIO fd 8 read 38 bytes "+ Ready for additional command text.\r " 38634 nginx RET recvfrom 38/0x26 38634 nginx CALL sendto(0x8,0x3f1170,0x6,0,0,0) 38634 nginx GIO fd 8 wrote 6 bytes " {8}\r " 38634 nginx RET sendto 6 38634 nginx CALL kevent(0x7,0x40c000,0,0x414000,0x200,0x7fdffffe3b0) 38634 nginx RET kevent 2 38634 nginx CALL gettimeofday(0x7fdffffe250,0) 38634 nginx RET gettimeofday 0 38634 nginx CALL recvfrom(0x8,0x47c000,0x2000,0,0,0) 38634 nginx GIO fd 8 read 52 bytes "LOGIN BAD Protocol Error: "Unknown command found".\r "

The OS is FreeBSD/sparc64, version 6-STABLE, nginx linked statically (if that counts).