diff --git a/.travis.yml b/.travis.yml
index 2ba02b9..b45cc46 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,7 +18,7 @@ addons:
 
 install:
   - if [ "$TRAVIS_OS_NAME" = 'osx' ]; then
-      brew update && brew install openssl;
+      brew update && brew install openssl socat;
       brew info openssl;
       ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/;
       ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/;
@@ -30,6 +30,7 @@ install:
       openssl version 2>&1 || true;
       $ACME_OPENSSL_BIN version 2>&1 || true;
       export PATH="$_old_path";
+    else sudo apt-get install socat;
     fi
   
 script:
diff --git a/Dockerfile b/Dockerfile
index 7ca042e..e85098e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ RUN apk update -f \
   && apk --no-cache add -f \
   openssl \
   curl \
-  netcat-openbsd \
+  socat \
   && rm -rf /var/cache/apk/*
 
 ENV LE_CONFIG_HOME /acme.sh
diff --git a/acme.sh b/acme.sh
index cd2f981..e774693 100755
--- a/acme.sh
+++ b/acme.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
-VER=2.7.3
+VER=2.7.4
 
 PROJECT_NAME="acme.sh"
 
@@ -164,11 +164,11 @@ _dlg_versions() {
     echo "nginx doesn't exists."
   fi
 
-  echo "nc:"
-  if _exists "nc"; then
-    nc -h 2>&1
+  echo "socat:"
+  if _exists "socat"; then
+    socat -h 2>&1
   else
-    _debug "nc doesn't exists."
+    _debug "socat doesn't exists."
   fi
 }
 
@@ -1814,7 +1814,13 @@ _send_signed_request() {
 
     _CACHED_NONCE="$(echo "$responseHeaders" | grep "Replay-Nonce:" | _head_n 1 | tr -d "\r\n " | cut -d ':' -f 2)"
 
-    if _contains "$response" "JWS has invalid anti-replay nonce"; then
+    _body="$response"
+    if [ "$needbase64" ]; then
+      _body="$(echo "$_body" | _dbase64)"
+      _debug2 _body "$_body"
+    fi
+
+    if _contains "$_body" "JWS has invalid anti-replay nonce"; then
       _info "It seems the CA server is busy now, let's wait and retry."
       _request_retry_times=$(_math "$_request_retry_times" + 1)
       _sleep 5
@@ -1967,68 +1973,22 @@ _startserver() {
   _debug "ncaddr" "$ncaddr"
 
   _debug "startserver: $$"
-  nchelp="$(nc -h 2>&1)"
 
   _debug Le_HTTPPort "$Le_HTTPPort"
   _debug Le_Listen_V4 "$Le_Listen_V4"
   _debug Le_Listen_V6 "$Le_Listen_V6"
-  _NC="nc"
 
+  _NC="socat"
   if [ "$Le_Listen_V4" ]; then
     _NC="$_NC -4"
   elif [ "$Le_Listen_V6" ]; then
     _NC="$_NC -6"
   fi
 
-  if [ "$Le_Listen_V4$Le_Listen_V6$ncaddr" ]; then
-    if ! _contains "$nchelp" "-4"; then
-      _err "The nc doesn't support '-4', '-6' or local-address, please install 'netcat-openbsd' and try again."
-      _err "See $(__green $_PREPARE_LINK)"
-      return 1
-    fi
-  fi
-
-  if echo "$nchelp" | grep "\-q[ ,]" >/dev/null; then
-    _NC="$_NC -q 1 -l $ncaddr"
-  else
-    if echo "$nchelp" | grep "GNU netcat" >/dev/null && echo "$nchelp" | grep "\-c, \-\-close" >/dev/null; then
-      _NC="$_NC -c -l $ncaddr"
-    elif echo "$nchelp" | grep "\-N" | grep "Shutdown the network socket after EOF on stdin" >/dev/null; then
-      _NC="$_NC -N -l $ncaddr"
-    else
-      _NC="$_NC -l $ncaddr"
-    fi
-  fi
-
   _debug "_NC" "$_NC"
-
-  #for centos ncat
-  if _contains "$nchelp" "nmap.org"; then
-    _debug "Using ncat: nmap.org"
-    if ! _exec "printf \"%s\r\n\r\n%s\" \"HTTP/1.1 200 OK\" \"$content\" | $_NC \"$Le_HTTPPort\" >&2"; then
-      _exec_err
-      return 1
-    fi
-    if [ "$DEBUG" ]; then
-      _exec_err
-    fi
-    return
-  fi
-
-  #  while true ; do
-  if ! _exec "printf \"%s\r\n\r\n%s\" \"HTTP/1.1 200 OK\" \"$content\" | $_NC -p \"$Le_HTTPPort\" >&2"; then
-    _exec "printf \"%s\r\n\r\n%s\" \"HTTP/1.1 200 OK\" \"$content\" | $_NC \"$Le_HTTPPort\" >&2"
-  fi
-
-  if [ "$?" != "0" ]; then
-    _err "nc listen error."
-    _exec_err
-    exit 1
-  fi
-  if [ "$DEBUG" ]; then
-    _exec_err
-  fi
-  #  done
+  #todo  listen address
+  $_NC TCP-LISTEN:$Le_HTTPPort,crlf,reuseaddr,fork SYSTEM:"sleep 0.5; echo HTTP/1.1 200 OK'; echo ; echo  $content; echo;" &
+  serverproc="$!"
 }
 
 _stopserver() {
@@ -2038,25 +1998,8 @@ _stopserver() {
     return
   fi
 
-  _debug2 "Le_HTTPPort" "$Le_HTTPPort"
-  if [ "$Le_HTTPPort" ]; then
-    if [ "$DEBUG" ] && [ "$DEBUG" -gt "3" ]; then
-      _get "http://localhost:$Le_HTTPPort" "" 1
-    else
-      _get "http://localhost:$Le_HTTPPort" "" 1 >/dev/null 2>&1
-    fi
-  fi
+  kill $pid
 
-  _debug2 "Le_TLSPort" "$Le_TLSPort"
-  if [ "$Le_TLSPort" ]; then
-    if [ "$DEBUG" ] && [ "$DEBUG" -gt "3" ]; then
-      _get "https://localhost:$Le_TLSPort" "" 1
-      _get "https://localhost:$Le_TLSPort" "" 1
-    else
-      _get "https://localhost:$Le_TLSPort" "" 1 >/dev/null 2>&1
-      _get "https://localhost:$Le_TLSPort" "" 1 >/dev/null 2>&1
-    fi
-  fi
 }
 
 # sleep sec
@@ -2111,12 +2054,7 @@ _starttlsserver() {
     return 1
   fi
 
-  __S_OPENSSL="${ACME_OPENSSL_BIN:-openssl} s_server -cert $TLS_CERT  -key $TLS_KEY "
-  if [ "$opaddr" ]; then
-    __S_OPENSSL="$__S_OPENSSL -accept $opaddr:$port"
-  else
-    __S_OPENSSL="$__S_OPENSSL -accept $port"
-  fi
+  __S_OPENSSL="socat"
 
   _debug Le_Listen_V4 "$Le_Listen_V4"
   _debug Le_Listen_V6 "$Le_Listen_V6"
@@ -2127,12 +2065,9 @@ _starttlsserver() {
   fi
 
   _debug "$__S_OPENSSL"
-  if [ "$DEBUG" ] && [ "$DEBUG" -ge "2" ]; then
-    (printf "%s\r\n\r\n%s" "HTTP/1.1 200 OK" "$content" | $__S_OPENSSL -tlsextdebug) &
-  else
-    (printf "%s\r\n\r\n%s" "HTTP/1.1 200 OK" "$content" | $__S_OPENSSL >/dev/null 2>&1) &
-  fi
 
+  #todo listen address
+  $__S_OPENSSL openssl-listen:$port,cert=$TLS_CERT,key=$TLS_KEY,verify=0,reuseaddr,fork SYSTEM:"sleep 0.5; echo HTTP/1.1 200 OK'; echo ; echo  $content; echo;" &
   serverproc="$!"
   sleep 1
   _debug serverproc "$serverproc"
@@ -2943,8 +2878,8 @@ _on_before_issue() {
   fi
 
   if _hasfield "$_chk_web_roots" "$NO_VALUE"; then
-    if ! _exists "nc"; then
-      _err "Please install netcat(nc) tools first."
+    if ! _exists "socat"; then
+      _err "Please install socat tools first."
       return 1
     fi
   fi
@@ -3665,13 +3600,12 @@ issue() {
         _info "Standalone mode server"
         _ncaddr="$(_getfield "$_local_addr" "$_ncIndex")"
         _ncIndex="$(_math $_ncIndex + 1)"
-        _startserver "$keyauthorization" "$_ncaddr" &
+        _startserver "$keyauthorization" "$_ncaddr"
         if [ "$?" != "0" ]; then
           _clearup
           _on_issue_err "$_post_hook" "$vlist"
           return 1
         fi
-        serverproc="$!"
         sleep 1
         _debug serverproc "$serverproc"
       elif [ "$_currentRoot" = "$MODE_STATELESS" ]; then
@@ -4006,7 +3940,10 @@ issue() {
   Le_NextRenewTime=$(_math "$Le_NextRenewTime" - 86400)
   _savedomainconf "Le_NextRenewTime" "$Le_NextRenewTime"
 
-  _on_issue_success "$_post_hook" "$_renew_hook"
+  if ! _on_issue_success "$_post_hook" "$_renew_hook"; then
+    _err "Call hook error."
+    return 1
+  fi
 
   if [ "$_real_cert$_real_key$_real_ca$_reload_cmd$_real_fullchain" ]; then
     _savedomainconf "Le_RealCertPath" "$_real_cert"
@@ -4788,9 +4725,9 @@ _precheck() {
     return 1
   fi
 
-  if ! _exists "nc"; then
-    _err "It is recommended to install nc first, try to install 'nc' or 'netcat'."
-    _err "We use nc for standalone server if you use standalone mode."
+  if ! _exists "socat"; then
+    _err "It is recommended to install socat first."
+    _err "We use socat for standalone server if you use standalone mode."
     _err "If you don't use standalone mode, just ignore this warning."
   fi
 
@@ -4890,9 +4827,11 @@ install() {
     _debug "Skip install cron job"
   fi
 
-  if ! _precheck "$_nocron"; then
-    _err "Pre-check failed, can not install."
-    return 1
+  if [ "$IN_CRON" != "1" ]; then
+    if ! _precheck "$_nocron"; then
+      _err "Pre-check failed, can not install."
+      return 1
+    fi
   fi
 
   if [ -z "$_c_home" ] && [ "$LE_CONFIG_HOME" != "$LE_WORKING_DIR" ]; then
@@ -4945,7 +4884,9 @@ install() {
 
   _info "Installed to $LE_WORKING_DIR/$PROJECT_ENTRY"
 
-  _installalias "$_c_home"
+  if [ "$IN_CRON" != "1" ]; then
+    _installalias "$_c_home"
+  fi
 
   for subf in $_SUB_FOLDERS; do
     if [ -d "$subf" ]; then
@@ -5035,7 +4976,7 @@ _uninstallalias() {
 }
 
 cron() {
-  IN_CRON=1
+  export IN_CRON=1
   _initpath
   _info "$(__green "===Starting cron===")"
   if [ "$AUTO_UPGRADE" = "1" ]; then
diff --git a/deploy/README.md b/deploy/README.md
index d0f3d7f..f76c667 100644
--- a/deploy/README.md
+++ b/deploy/README.md
@@ -6,6 +6,8 @@ Here are the scripts to deploy the certs/key to the server/services.
 
 ## 1. Deploy the certs to your cpanel host.
 
+If you want to deploy using cpanel UAPI see 7.
+
 (cpanel deploy hook is not finished yet, this is just an example.)
 
 
@@ -81,18 +83,19 @@ acme.sh --deploy -d ftp.example.com --deploy-hook exim4
 acme.sh --deploy -d ftp.example.com --deploy-hook keychain
 ```
 
-## 7. Deploy to cpanel host.
+## 7. Deploy to cpanel host using UAPI
 
+This hook is using UAPI and works in cPanel & WHM version 56 or newer.
 ```
 acme.sh  --deploy  -d example.com  --deploy-hook cpanel_uapi
 ```
-
-If you are login as root, please specify the username to deploy cert to:
-
+DEPLOY_CPANEL_USER is required only if you run the script as root and it should contain cpanel username.
 ```sh
 export DEPLOY_CPANEL_USER=username
 acme.sh  --deploy  -d example.com  --deploy-hook cpanel_uapi
 ```
+Please note, that the cpanel_uapi hook will deploy only the first domain when your certificate will automatically renew. Therefore you should issue a separete certificate for each domain. 
+
 ## 8. Deploy the cert to your FRITZ!Box router
 
 You must specify the credentials that have administrative privileges on the FRITZ!Box in order to deploy the certificate, plus the URL of your FRITZ!Box, through the following environment variables:
diff --git a/dnsapi/dns_he.sh b/dnsapi/dns_he.sh
index 7d86eb7..4d1973a 100755
--- a/dnsapi/dns_he.sh
+++ b/dnsapi/dns_he.sh
@@ -47,7 +47,7 @@ dns_he_add() {
   response="$(_post "$body" "https://dns.he.net/")"
   exit_code="$?"
   if [ "$exit_code" -eq 0 ]; then
-    _info "TXT record added successfuly."
+    _info "TXT record added successfully."
   else
     _err "Couldn't add the TXT record."
   fi
@@ -96,7 +96,7 @@ dns_he_rm() {
       >/dev/null
   exit_code="$?"
   if [ "$exit_code" -eq 0 ]; then
-    _info "Record removed successfuly."
+    _info "Record removed successfully."
   else
     _err "Could not clean (remove) up the record. Please go to HE administration interface and clean it by hand."
     return "$exit_code"