diff --git a/fhem/FHEM/01_FHEMWEB.pm b/fhem/FHEM/01_FHEMWEB.pm
index 1ef9b4d30..06829cdd1 100755
--- a/fhem/FHEM/01_FHEMWEB.pm
+++ b/fhem/FHEM/01_FHEMWEB.pm
@@ -164,6 +164,7 @@ FHEMWEB_Initialize($)
     reverseLogs:0,1
     roomIcons
     sortRooms
+    sslVersion
     smallscreen:unused
     smallscreenCommands:0,1
     stylesheetPrefix
@@ -3395,6 +3396,9 @@ FW_widgetOverride($$)
         smallscreen landscape mode.
         </li><br>
 
+     <li>sslVersion<br>
+        See the global attribute sslVersion.
+        </li><br>
 
     </ul>
   </ul>
@@ -4105,6 +4109,10 @@ FW_widgetOverride($$)
         Smallscreen Landscape Modus angezeigt.
         </li><br>
 
+     <li>sslVersion<br>
+        Siehe das global Attribut sslVersion.
+        </li><br>
+
     </ul>
   </ul>
 
diff --git a/fhem/FHEM/98_telnet.pm b/fhem/FHEM/98_telnet.pm
index 32e46b476..21f52c0fd 100644
--- a/fhem/FHEM/98_telnet.pm
+++ b/fhem/FHEM/98_telnet.pm
@@ -22,7 +22,7 @@ telnet_Initialize($)
   $hash->{NotifyFn}= "telnet_SecurityCheck";
   $hash->{AttrList} = "globalpassword password prompt ".
                         "allowfrom SSL connectTimeout connectInterval ".
-                        "encoding:utf8,latin1";
+                        "encoding:utf8,latin1 sslVersion";
   $hash->{ActivateInformFn} = "telnet_ActivateInform";
 
   my %lhash = ( Fn=>"CommandTelnetEncoding",
@@ -471,9 +471,13 @@ telnet_ActivateInform($;$)
 
     <a name="encoding"></a>
     <li>encoding<br>
-        Sets the encoding for the data send to the client. Possible values are latin1 and utf8. Default is utf8.
+        Sets the encoding for the data send to the client. Possible values are
+        latin1 and utf8. Default is utf8.
         </li><br>
 
+     <li>sslVersion<br>
+        See the global attribute sslVersion.
+        </li><br>
 
   </ul>
 
@@ -634,6 +638,9 @@ telnet_ActivateInform($;$)
         M&ouml;gliche Werte sind utf8 und latin1. Standardwert ist utf8. 
     </li><br>
 
+     <li>sslVersion<br>
+        Siehe das global Attribut sslVersion.
+        </li><br>
 
   </ul>
 
diff --git a/fhem/FHEM/HttpUtils.pm b/fhem/FHEM/HttpUtils.pm
index f2fe5b378..8a7760793 100644
--- a/fhem/FHEM/HttpUtils.pm
+++ b/fhem/FHEM/HttpUtils.pm
@@ -185,9 +185,11 @@ HttpUtils_Connect2($)
       Log3 $hash, $hash->{loglevel}, $@;
     } else {
       $hash->{conn}->blocking(1);
+      my $sslVersion = AttrVal($hash->{NAME}, "sslVersion", 
+                       AttrVal("global", "sslVersion", "SSLv23:!SSLv3:!SSLv2"));
       IO::Socket::SSL->start_SSL($hash->{conn}, {
           Timeout     => $hash->{timeout},
-          SSL_version => 'SSLv23:!SSLv3:!SSLv2', #Forum #27565
+          SSL_version => $sslVersion
         }) || undef $hash->{conn};
     }
   }
diff --git a/fhem/FHEM/TcpServerUtils.pm b/fhem/FHEM/TcpServerUtils.pm
index cd8731362..aeb542ff4 100644
--- a/fhem/FHEM/TcpServerUtils.pm
+++ b/fhem/FHEM/TcpServerUtils.pm
@@ -83,6 +83,10 @@ TcpServer_Accept($$)
   #$clientinfo[0]->blocking(0);  # Forum #24799
 
   if($hash->{SSL}) {
+    # Forum #27565: SSLv23:!SSLv3:!SSLv2', #35004: TLSv12:!SSLv3
+    my $sslVersion = AttrVal($hash->{NAME}, "sslVersion", 
+                     AttrVal("global", "sslVersion", "TLSv12:!SSLv3"));
+
     # Certs directory must be in the modpath, i.e. at the same level as the
     # FHEM directory
     my $mp = AttrVal("global", "modpath", ".");
@@ -90,8 +94,7 @@ TcpServer_Accept($$)
       SSL_server    => 1, 
       SSL_key_file  => "$mp/certs/server-key.pem",
       SSL_cert_file => "$mp/certs/server-cert.pem",
-      #SSL_version   => 'SSLv23:!SSLv3:!SSLv2', #Forum #27565
-      SSL_version => 'TLSv12:!SSLv3', # Forum  #35004
+      SSL_version => $sslVersion,
       SSL_cipher_list => 'HIGH:!RC4:!eNULL:!aNULL',
       Timeout       => 4,
       });
diff --git a/fhem/docs/commandref_frame.html b/fhem/docs/commandref_frame.html
index ec0acc96b..98860d2f4 100644
--- a/fhem/docs/commandref_frame.html
+++ b/fhem/docs/commandref_frame.html
@@ -1456,6 +1456,14 @@ The following local attributes are used by a wider range of devices:
         overview and by xmllist.
     </li><br>
 
+    <a name="sslVersion"></a>
+    <li>sslVersion<br>
+        Specifies the accepted cryptography algorithms by all modules using the
+        TcpServices helper module. The current default TLSv12:!SSLv3 is thought
+        to be more secure than the previously used SSLv23:!SSLv3:!SSLv2, but it
+        causes problems with some not updated web services.
+    </li><br>
+
     <a name="stacktrace"></a>
     <li>stacktrace<br>
         if set (to 1), dump a stacktrace to the log for each "PERL WARNING".
diff --git a/fhem/docs/commandref_frame_DE.html b/fhem/docs/commandref_frame_DE.html
index 26514dfab..706672594 100644
--- a/fhem/docs/commandref_frame_DE.html
+++ b/fhem/docs/commandref_frame_DE.html
@@ -1552,6 +1552,14 @@ Die folgenden lokalen Attribute werden von mehreren Ger&auml;ten verwendet:
       xmllist Befehl, und bei der FHEMWEB Raumansicht gepr&uuml;ft.
     </li><br>
 
+    <a name="sslVersion"></a>
+    <li>sslVersion<br>
+        Setzt die akzeptierten Crypto-Algorithmen im TcpServices Hilfsmodul.
+        Die Voreinstellung TLSv12:!SSLv3 wird als sicherer erachtet als die
+        vorherige SSLv23:!SSLv3:!SSLv2, aber sie kann Probleme mit nicht
+        ausreichend aktualisierten Netzwerk-Diensten verursachen.
+    </li><br>
+
     <a name="stacktrace"></a>
     <li>stacktrace<br>
         Falls gesetzt (auf 1), schreibt ins FHEM-Log zus&auml;tzlich zu jedem
diff --git a/fhem/fhem.pl b/fhem/fhem.pl
index 3b88d0e8a..281504ac6 100755
--- a/fhem/fhem.pl
+++ b/fhem/fhem.pl
@@ -281,6 +281,7 @@ my @globalAttrList = qw(
   restoreDirs
   sendStatistics:onUpdate,manually,never
   showInternalValues:1,0
+  sslVersion
   stacktrace:1,0
   statefile
   title