diff --git a/Makefile b/Makefile
index 1cec028..a738add 100755
--- a/Makefile
+++ b/Makefile
@@ -57,7 +57,7 @@ DBGFLAGS = -g -O0 -Wall -D AQ_DEBUG -D AQ_TM_DEBUG
 
 # Mongoose 7.19 flags
 #MGFLAGS = -D MG_TLS=2 #(2=MG_TLS_OPENSSL. 3=MG_TLS_BUILTIN) --or--  -DMG_TLS=MG_TLS_BUILTIN
-MGFLAGS = -D MG_TLS=3
+MGFLAGS = -D MG_TLS=3 -D MG_ENABLE_SSI=0
 
 # Detect OS and set some specifics
 ifeq ($(OS),Windows_NT)
diff --git a/README.md b/README.md
index ff72587..6a76db5 100644
--- a/README.md
+++ b/README.md
@@ -148,6 +148,7 @@ NEED TO FIX FOR THIS RELEASE.
 * Fixed bug with sensor UOM.
 * UI code cleanup.
 * Included program advance to AqualinkD programmable light mode. (lot quicker for lights that remember state)
+* Changed caching of HTTP server. (Better for UI config updates)
 
 * Need to finish off :-
   * HAT serial optimizations broke some USB serial adapters
diff --git a/extras/generate-certs.sh b/extras/generate-certs.sh
new file mode 100755
index 0000000..22080b1
--- /dev/null
+++ b/extras/generate-certs.sh
@@ -0,0 +1,42 @@
+#/bin/sh
+#
+# Geneate self-signed ECC certificates
+
+#cd `dirname $0`
+
+# Create cnf for adding SAN DNS:aqualinkd.local
+cat > cnf <<EOF
+[SAN]
+subjectAltName=DNS:aqualinkd.local
+EOF
+
+# Generate CA
+# Important: CN names must be different for CA and client/server certs
+openssl ecparam -noout -name prime256v1 -genkey -out ca.key
+openssl req -x509 -new -key ca.key -days 3650 -subj /CN=AqualinkD -out ca.crt
+
+# Generate server cert
+openssl ecparam -noout -name prime256v1 -genkey -out server.key
+openssl req -new -sha256 -key server.key -days 3650 -subj /CN=server -out server.csr
+openssl x509 -req -sha256 -in server.csr -extensions SAN -extfile cnf \
+  -CAkey ca.key -CA ca.crt -CAcreateserial -days 3650 -out server.crt
+
+# Generate client cert
+openssl ecparam -noout -name prime256v1 -genkey -out client.key
+openssl req -new -sha256 -key client.key -days 3650 -subj /CN=client -out client.csr
+openssl x509 -req -sha256 -in client.csr -extensions SAN -extfile cnf \
+  -CAkey ca.key -CA ca.crt -CAcreateserial -days 3650 -out client.crt
+
+# Verify
+openssl verify -verbose -CAfile ca.crt server.crt
+openssl verify -verbose -CAfile ca.crt client.crt
+
+# Inspect
+# openssl x509 -text -noout -ext subjectAltName -in server.crt
+
+# Create links to valid file names we want for HTTPS server
+ln -s ./server.crt ./crt.pem
+ln -s ./server.key ./key.pem
+
+# If we want 2 way auth, add the ca.   ie server validates client and client validates server
+#ln -s ./ca.crt ./ca.pem  
\ No newline at end of file
diff --git a/release/aqualinkd-arm64 b/release/aqualinkd-arm64
index d22fbbe..bfaa48e 100755
Binary files a/release/aqualinkd-arm64 and b/release/aqualinkd-arm64 differ
diff --git a/release/aqualinkd-armhf b/release/aqualinkd-armhf
index baec71d..585925a 100755
Binary files a/release/aqualinkd-armhf and b/release/aqualinkd-armhf differ
diff --git a/release/serial_logger-arm64 b/release/serial_logger-arm64
index 3ab1a5d..ee5ea25 100755
Binary files a/release/serial_logger-arm64 and b/release/serial_logger-arm64 differ
diff --git a/release/serial_logger-armhf b/release/serial_logger-armhf
index 606d329..4acc471 100755
Binary files a/release/serial_logger-armhf and b/release/serial_logger-armhf differ
diff --git a/source/aq_serial.c b/source/aq_serial.c
index c22e30d..0481029 100644
--- a/source/aq_serial.c
+++ b/source/aq_serial.c
@@ -438,12 +438,12 @@ int lock_port(int fd, const char* tty)
     LOG(RSSD_LOG,LOG_ERR, "Can't put (%s) into exclusive mode (%d): %s\n", tty,errno, strerror( errno ));
     return -1;
   }
-
+/*
   if (flock(fd, LOCK_EX | LOCK_NB) < 0) {
     LOG(RSSD_LOG,LOG_ERR, "Can't lock (%s) (%d): %s\n", tty,errno, strerror( errno ));
     return -1;
   }
-  
+*/
   return 0;
 }
 
@@ -453,12 +453,14 @@ int unlock_port(int fd)
     LOG(RSSD_LOG,LOG_ERR, "Failed to remove into exclusive mode (%d): %s\n", errno, strerror( errno ));
   }
 
+  /*
   if (flock(fd, LOCK_UN) < 0) {
     //if (!isAqualinkDStopping()) {
       LOG(RSSD_LOG,LOG_ERR, "Can't unlock serial port (%d): %s\n",errno, strerror( errno ));
     //}
     return -1;
   }
+*/
   return 0;
 }
 
diff --git a/source/aq_systemutils.c b/source/aq_systemutils.c
index 2276920..0350eaa 100644
--- a/source/aq_systemutils.c
+++ b/source/aq_systemutils.c
@@ -255,7 +255,8 @@ bool run_aqualinkd_upgrade(uint8_t type)
 
 #if MG_TLS > 0
 
-char* read_pem_file(const char* fmt, ...) {
+// silentError is only silent if the file does not exist.
+char* read_pem_file(bool silentError, const char* fmt, ...) {
     char filepath[1024];
 
     // Build file path from format + arguments
@@ -266,7 +267,7 @@ char* read_pem_file(const char* fmt, ...) {
 
     FILE* file = fopen(filepath, "rb");
     if (!file) {
-        LOG(AQUA_LOG, LOG_ERR, "Failed to open file %s\n",filepath);
+        if (!silentError){LOG(AQUA_LOG, LOG_ERR, "Failed to open file %s\n",filepath);}
         return NULL;
     }
 
diff --git a/source/aq_systemutils.h b/source/aq_systemutils.h
index 5863851..afc0776 100644
--- a/source/aq_systemutils.h
+++ b/source/aq_systemutils.h
@@ -3,7 +3,7 @@
 
 #if MG_TLS > 0
   #define MAX_PEM_SIZE (64 * 1024)  // 64KB limit
-  char* read_pem_file(const char* fmt, ...);
+  char* read_pem_file(bool silentError, const char* fmt, ...);
 #endif
 
 FILE *aq_open_file( char *filename, bool *ro_root, bool* created_file);
diff --git a/source/net_services.c b/source/net_services.c
index 8773485..5899750 100644
--- a/source/net_services.c
+++ b/source/net_services.c
@@ -95,7 +95,7 @@ bool uri_strcmp(const char *uri, const char *string);
 //static const char *s_http_port = "8080";
 //static struct mg_serve_http_opts _http_server_opts;
 static struct mg_http_serve_opts _http_server_opts;
-
+static struct mg_http_serve_opts _http_server_opts_nocache;
 
 static void net_signal_handler(int sig_num) {
   intHandler(sig_num); // Force signal handler to aqualinkd.c
@@ -1605,7 +1605,11 @@ void action_web_request(struct mg_connection *nc, struct mg_http_message *http_m
   // If we have a get request, pass it
   if (strncmp(http_msg->uri.buf, "/api", 4 ) != 0) {
       DEBUG_TIMER_START(&tid);
-      mg_http_serve_dir(nc, http_msg, &_http_server_opts);
+      if ( FAST_SUFFIX_3_CI(http_msg->uri.buf, http_msg->uri.len, ".js") ) {
+        mg_http_serve_dir(nc, http_msg, &_http_server_opts_nocache);
+      } else {
+        mg_http_serve_dir(nc, http_msg, &_http_server_opts);
+      }
       DEBUG_TIMER_STOP(tid, NET_LOG, "action_web_request() serve file took");
   } else {
     char buf[JSON_BUFFER_SIZE];
@@ -1709,14 +1713,14 @@ void action_web_request(struct mg_connection *nc, struct mg_http_message *http_m
           }
           LOG(NET_LOG, LOG_DEBUG, "Downloading log of max %d lines\n",value>0?(int)value:DEFAULT_LOG_DOWNLOAD_LINES);
           if (write_systemd_logmessages_2file("/dev/shm/aqualinkd.log", value>0?(int)value:DEFAULT_LOG_DOWNLOAD_LINES) ) {
-            mg_http_serve_file(nc, http_msg, "/dev/shm/aqualinkd.log", &_http_server_opts);
+            mg_http_serve_file(nc, http_msg, "/dev/shm/aqualinkd.log", &_http_server_opts_nocache);
             remove("/dev/shm/aqualinkd.log");
           }
         break;
 
         case uConfigDownload:
           LOG(NET_LOG, LOG_DEBUG, "Downloading config\n");
-          mg_http_serve_file(nc, http_msg, _aqconfig_.config_file, &_http_server_opts);
+          mg_http_serve_file(nc, http_msg, _aqconfig_.config_file, &_http_server_opts_nocache);
         break;
 #endif
         case uBad:
@@ -1941,25 +1945,20 @@ static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
     if (nc->is_tls) {
       static char *crt;
       static char *key; 
+      static char *ca;
       
       struct mg_tls_opts opts;
       memset(&opts, 0, sizeof(opts));
 
       if (crt == NULL || key == NULL) {
         LOG(NET_LOG,LOG_NOTICE, "HTTPS: loading certs from : %s\n", _aqconfig_.cert_dir);
-        crt = read_pem_file("%s/crt.pem",_aqconfig_.cert_dir);
-        key = read_pem_file("%s/key.pem",_aqconfig_.cert_dir);
+        crt = read_pem_file(false, "%s/crt.pem",_aqconfig_.cert_dir);
+        key = read_pem_file(false, "%s/key.pem",_aqconfig_.cert_dir);
+        ca = read_pem_file(true, "%s/ca.pem",_aqconfig_.cert_dir); // If this doesn't exist we don't care. If it exists, 2 way auth
       }
+      opts.ca = mg_str(ca);    // Most cases this will be null, only get's set for 2 way auth (ie load cert and authority onto client)
       opts.cert = mg_str(crt);
-      opts.key = mg_str(key);
-
-#ifdef TLS_TWOWAY
-      static char *ca;
-      if (ca == NULL)
-        ca = read_pem_file("%s/ca.pem",_aqconfig_.cert_dir);
-      opts.ca = mg_str(ca);
-#endif
-      
+      opts.key = mg_str(key);      
       mg_tls_init(nc, &opts);
     }
 #endif
@@ -1981,9 +1980,9 @@ static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
 
       if (crt == NULL || key == NULL) {
         LOG(NET_LOG,LOG_NOTICE, "MQTTS: loading certs from : %s\n", _aqconfig_.mqtt_cert_dir);
-        crt = read_pem_file("%s/crt.pem",_aqconfig_.cert_dir);
-        key = read_pem_file("%s/key.pem",_aqconfig_.cert_dir);
-        ca = read_pem_file("%s/ca.pem",_aqconfig_.cert_dir);
+        crt = read_pem_file(false, "%s/crt.pem",_aqconfig_.cert_dir);
+        key = read_pem_file(false, "%s/key.pem",_aqconfig_.cert_dir);
+        ca = read_pem_file(true, "%s/ca.pem",_aqconfig_.cert_dir);
       }
       opts.cert = mg_str(crt);
       opts.key = mg_str(key);
@@ -2186,11 +2185,13 @@ bool _start_net_services(struct mg_mgr *mgr, struct aqualinkdata *aqdata) {
   }
 
   // Set default web options
-  _http_server_opts.root_dir = _aqconfig_.web_directory;  // Serve current directory
-  _http_server_opts.extra_headers = "Cache-Control: public, max-age=604800, immutable\r\n"; // 7 days
-  //_http_server_opts.extra_headers = "Cache-Control: public, max-age=31536000,immutable\r\n"; // 1 year.  Let's be as agressive on browser caching.
-  // Need to disable directory_listing somehow
-  
+  _http_server_opts.root_dir = _aqconfig_.web_directory;
+  _http_server_opts.extra_headers = CACHE; 
+  _http_server_opts.ssi_pattern = NULL;
+
+  _http_server_opts_nocache.root_dir = _aqconfig_.web_directory;
+  _http_server_opts_nocache.extra_headers = NO_CACHE;
+  _http_server_opts_nocache.ssi_pattern = NULL;
   // Start MQTT
   start_mqtt(mgr);
 
diff --git a/source/net_services.h b/source/net_services.h
index d1f192f..e27bfe3 100644
--- a/source/net_services.h
+++ b/source/net_services.h
@@ -11,9 +11,12 @@
 //#define CONTENT_JS   "Content-Type: text/javascript"
 //#define CONTENT_TEXT  "Content-Type: text/plain"
 
-#define CONTENT_JSON "Content-Type: application/json\r\n"
-#define CONTENT_JS   "Content-Type: text/javascript\r\n"
-#define CONTENT_TEXT "Content-Type: text/plain\r\n"
+//#define CACHE    "Cache-Control: public, max-age=31536000,immutable\r\n" // 1 year
+#define CACHE    "Cache-Control: public, max-age=604800, immutable\r\n" // 7 days
+#define NO_CACHE "Cache-Control: no-cache, no-store, must-revalidate\r\nPragma: no-cache\r\nExpires: 0\r\n"
+#define CONTENT_JSON NO_CACHE"Content-Type: application/json\r\n"
+#define CONTENT_JS   NO_CACHE"Content-Type: text/javascript\r\n"
+#define CONTENT_TEXT NO_CACHE "Content-Type: text/plain\r\n"
 
 
 //void main_server();
diff --git a/source/version.h b/source/version.h
index 1aabe04..984e68d 100644
--- a/source/version.h
+++ b/source/version.h
@@ -4,5 +4,5 @@
 #define AQUALINKD_SHORT_NAME "AqualinkD"
 
 // Use Magor . Minor . Patch
-#define AQUALINKD_VERSION "3.0.0 (dev 4)"
+#define AQUALINKD_VERSION "3.0.0 (dev r5)"
  
\ No newline at end of file