X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=telnet.c;h=fe6f5cf94507ab8c600c9cab3f01c0071563a832;hb=df913d00360aea784521662ad42c11e3933bb6f8;hp=54b9a7c7db875fc1d6dd207acd97ff5275da159b;hpb=b36d32b88169ca3f155d0d3f8e4cf7bb3f7b60fa;p=PuTTY.git

diff --git a/telnet.c b/telnet.c
index 54b9a7c7..fe6f5cf9 100644
--- a/telnet.c
+++ b/telnet.c
@@ -394,9 +394,12 @@ static void proc_rec_opt(Telnet telnet, int cmd, int option)
     }
     /*
      * If we reach here, the option was one we weren't prepared to
-     * cope with. So send a negative ack.
+     * cope with. If the request was positive (WILL or DO), we send
+     * a negative ack to indicate refusal. If the request was
+     * negative (WONT / DONT), we must do nothing.
      */
-    send_opt(telnet, (cmd == WILL ? DONT : WONT), option);
+    if (cmd == WILL || cmd == DO)
+        send_opt(telnet, (cmd == WILL ? DONT : WONT), option);
 }
 
 static void process_subneg(Telnet telnet)