Index: libsmbclient.c
===================================================================
--- libsmbclient.c	(revision 15419)
+++ libsmbclient.c	(working copy)
@@ -370,11 +370,18 @@
 		}
 
 		if (strchr_m(u, ':')) {
+			if( u[0] == ':' ) {
 
-			next_token(&u, username, ":", sizeof(fstring));
+				u++;
+				pstrcpy(username, u);
+			}
+			else {
 
-			pstrcpy(passwd, u);
+				next_token(&u, username, ":", sizeof(fstring));
 
+				pstrcpy(passwd, u);
+			}
+
 		}
 		else {