Set the default --max-conns to 60 on Windows.

Suggested by Andrey Olkhin.
http://seclists.org/nmap-dev/2013/q1/390

CHANGELOG

@@ -1,5 +1,9 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o [Ncat] Reduced the default --max-conns limit from 100 to 60 on
+  Windows, to stay within platform limitations. Suggested by Andrey
+  Olkhin.
+
 o Fixed IPv6 routing table alignment on NetBSD.
 
 o [NSE] Added http-phpmyadmin-dir-traversal by Alexey Meshcheryakov.

ncat/docs/ncat.xml

@@ -242,7 +242,7 @@
         </term>
         <listitem>
           <para>The maximum number of simultaneous connections accepted by an Ncat
-          instance. 100 is the default.</para>
+          instance. 100 is the default (60 on Windows).</para>
         </listitem>
       </varlistentry>
 
@@ -461,7 +461,7 @@
           specified port/application like inetd. Ncat will only
           accept a maximum, definable, number of simultaneous connections
           controlled by the <option>-m</option> option. By default this is set
-          to 100.</para>
+          to 100 (60 on Windows).</para>
         </listitem>
       </varlistentry>
 

ncat/ncat.h

@@ -173,7 +173,13 @@ struct socks4_data {
  * a listening port. You may want to increase or decrease this value depending
  * on your specific needs.
  */
+#ifdef WIN32
+/* Windows is commonly limited to 64 sockets, so keep the default somewhat below
+   that. http://www.tangentsoft.net/wskfaq/advanced.html#64sockets */
+#define DEFAULT_MAX_CONNS 60
+#else
 #define DEFAULT_MAX_CONNS 100
+#endif
 
 /* SOCKS4 protocol responses */
 #define SOCKS4_VERSION          4