diff --git a/src/decode-ipv6.c b/src/decode-ipv6.c
index 6e7e472fe9..6090879119 100644
--- a/src/decode-ipv6.c
+++ b/src/decode-ipv6.c
@@ -419,25 +419,25 @@ void DecodeIPV6(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt,
 
 #ifdef DEBUG
     if (IPV6_EXTHDR_ISSET_FH(p)) {
-        printf("IPV6 FRAG - HDRLEN: %" PRIuMAX " NH: %" PRIu32 " OFFSET: %" PRIu32 " ID: %" PRIu32 "\n",
+        SCLogDebug("IPV6 FRAG - HDRLEN: %" PRIuMAX " NH: %" PRIu32 " OFFSET: %" PRIu32 " ID: %" PRIu32 "",
             (uintmax_t)IPV6_EXTHDR_GET_FH_HDRLEN(p), IPV6_EXTHDR_GET_FH_NH(p),
             IPV6_EXTHDR_GET_FH_OFFSET(p), IPV6_EXTHDR_GET_FH_ID(p));
     }
     if (IPV6_EXTHDR_ISSET_RH(p)) {
-        printf("IPV6 ROUTE - HDRLEN: %" PRIu32 " NH: %" PRIu32 " TYPE: %" PRIu32 "\n",
+        SCLogDebug("IPV6 ROUTE - HDRLEN: %" PRIu32 " NH: %" PRIu32 " TYPE: %" PRIu32 "",
             IPV6_EXTHDR_GET_RH_HDRLEN(p), IPV6_EXTHDR_GET_RH_NH(p),
             IPV6_EXTHDR_GET_RH_TYPE(p));
     }
     if (IPV6_EXTHDR_ISSET_HH(p)) {
-        printf("IPV6 HOPOPT - HDRLEN: %" PRIu32 " NH: %" PRIu32 "\n",
+        SCLogDebug("IPV6 HOPOPT - HDRLEN: %" PRIu32 " NH: %" PRIu32 "",
             IPV6_EXTHDR_GET_HH_HDRLEN(p), IPV6_EXTHDR_GET_HH_NH(p));
     }
     if (IPV6_EXTHDR_ISSET_DH1(p)) {
-        printf("IPV6 DSTOPT1 - HDRLEN: %" PRIu32 " NH: %" PRIu32 "\n",
+        SCLogDebug("IPV6 DSTOPT1 - HDRLEN: %" PRIu32 " NH: %" PRIu32 "",
             IPV6_EXTHDR_GET_DH1_HDRLEN(p), IPV6_EXTHDR_GET_DH1_NH(p));
     }
     if (IPV6_EXTHDR_ISSET_DH2(p)) {
-        printf("IPV6 DSTOPT2 - HDRLEN: %" PRIu32 " NH: %" PRIu32 "\n",
+        SCLogDebug("IPV6 DSTOPT2 - HDRLEN: %" PRIu32 " NH: %" PRIu32 "",
             IPV6_EXTHDR_GET_DH2_HDRLEN(p), IPV6_EXTHDR_GET_DH2_NH(p));
     }
 #endif
diff --git a/src/detect.c b/src/detect.c
index 2884f40e2b..e499cabf77 100644
--- a/src/detect.c
+++ b/src/detect.c
@@ -243,7 +243,9 @@ int DetectLoadSigFile(DetectEngineCtx *de_ctx, char *sig_file) {
     }
     fclose(fp);
 
-    SCLogInfo("%" PRId32 " successfully loaded from file %s. %" PRId32 " sigs failed to load", good, sig_file, bad);
+    SCLogInfo("%" PRId32 " successfully loaded from file %s.", good, sig_file);
+    if (bad)
+        SCLogInfo("%" PRId32 " sigs failed to load from file %s.", bad, sig_file);
     if (good == 0)
         return 0;
     else
@@ -265,29 +267,41 @@ int SigLoadSignatures (DetectEngineCtx *de_ctx, char *sig_file)
 
     /* http_uri -- for uricontent */
     sig = SigInit(de_ctx, "alert tcp any any -> any $HTTP_PORTS (msg:\"HTTP GET URI cap\"; flow:to_server,established; content:\"GET \"; depth:4; pcre:\"/^GET (?P<pkt_http_uri>.*) HTTP\\/\\d\\.\\d\\r\\n/G\"; noalert; sid:1;)");
-    if (sig == NULL)
+    if (sig == NULL) {
+        SCLogError(SC_ERR_NO_RULES, "Is HTTP_PORTS variable defined in "
+                                    "configuration file");
         return -1;
+    }
 
     prevsig = sig;
     de_ctx->sig_list = sig;
 
     sig = SigInit(de_ctx, "alert tcp any any -> any $HTTP_PORTS (msg:\"HTTP POST URI cap\"; flow:to_server,established; content:\"POST \"; depth:5; pcre:\"/^POST (?P<pkt_http_uri>.*) HTTP\\/\\d\\.\\d\\r\\n/G\"; noalert; sid:2;)");
-    if (sig == NULL)
+    if (sig == NULL) {
+        SCLogError(SC_ERR_NO_RULES, "Is HTTP_PORTS variable defined in "
+                                    "configuration file");
         return -1;
+    }
     prevsig->next = sig;
     prevsig = sig;
 
     /* http_host -- for the log-httplog module */
     sig = SigInit(de_ctx, "alert tcp any any -> any $HTTP_PORTS (msg:\"HTTP host cap\"; flow:to_server,established; content:\"|0d 0a|Host:\"; pcre:\"/^Host: (?P<pkt_http_host>.*)\\r\\n/m\"; noalert; sid:3;)");
-    if (sig == NULL)
+    if (sig == NULL) {
+        SCLogError(SC_ERR_NO_RULES, "Is HTTP_PORTS variable defined in "
+                                    "configuration file");
         return -1;
+    }
     prevsig->next = sig;
     prevsig = sig;
 
     /* http_ua -- for the log-httplog module */
     sig = SigInit(de_ctx, "alert tcp any any -> any $HTTP_PORTS (msg:\"HTTP UA cap\"; flow:to_server,established; content:\"|0d 0a|User-Agent:\"; pcre:\"/^User-Agent: (?P<pkt_http_ua>.*)\\r\\n/m\"; noalert; sid:4;)");
-    if (sig == NULL)
+    if (sig == NULL) {
+        SCLogError(SC_ERR_NO_RULES, "Is HTTP_PORTS variable defined in "
+                                    "configuration file");
         return -1;
+    }
     prevsig->next = sig;
 
     /* ok, now let's load signature files from the general config */
diff --git a/src/suricata.c b/src/suricata.c
index 1f77a1663c..d5e730f8c2 100644
--- a/src/suricata.c
+++ b/src/suricata.c
@@ -277,6 +277,10 @@ void usage(const char *progname)
     printf("\t--fatal-unittests            : enable fatal failure on unittest error\n");
 #endif /* UNITTESTS */
     printf("\n");
+    printf("\nTo run the engine with default configuration on "
+            "interface eth0 with signature file \"signatures.rules\", run the "
+            "command as:\n\n%s -c suricata.yaml -s signatures.rules -i eth0 \n\n",
+            progname);
 }
 
 int main(int argc, char **argv)
@@ -423,8 +427,10 @@ int main(int argc, char **argv)
     /* Load yaml configuration file if provided. */
     if (conf_filename != NULL) {
         ConfYamlLoadFile(conf_filename);
-    } else {
+    } else if (mode != MODE_UNITTEST){
         SCLogError(SC_ERR_OPENING_FILE, "Configuration file has not been provided");
+        usage(argv[0]);
+        exit(EXIT_FAILURE);
     }
 
     if (dump_config) {