diff --git a/application/src/main/resources/thingsboard.yml b/application/src/main/resources/thingsboard.yml
index 889df54848..d5b8cfe15e 100644
--- a/application/src/main/resources/thingsboard.yml
+++ b/application/src/main/resources/thingsboard.yml
@@ -1157,7 +1157,7 @@ transport:
       # - A value of 0 means we accept using CID but will not generate one for foreign peer (enables support but not for incoming traffic).
       # - A value between 0 and <= 4: SingleNodeConnectionIdGenerator is used
       # - A value that are > 4: MultiNodeConnectionIdGenerator is used
-      connection_id_length: "${LWM2M_DTLS_CONNECTION_ID_LENGTH:}"
+      connection_id_length: "${LWM2M_DTLS_CONNECTION_ID_LENGTH:8}"
     server:
       # LwM2M Server ID
       id: "${LWM2M_SERVER_ID:123}"
@@ -1345,7 +1345,7 @@ coap:
     # - A value of 0 means we accept using CID but will not generate one for foreign peer (enables support but not for incoming traffic).
     # - A value between 0 and <= 4: SingleNodeConnectionIdGenerator is used
     # - A value that are > 4: MultiNodeConnectionIdGenerator is used
-    connection_id_length: "${COAP_DTLS_CONNECTION_ID_LENGTH:}"
+    connection_id_length: "${COAP_DTLS_CONNECTION_ID_LENGTH:8}"
     # Specify the MTU (Maximum Transmission Unit).
     # Should be used if LAN MTU is not used, e.g. if IP tunnels are used or if the client uses a smaller value than the LAN MTU.
     # Default = 1024
diff --git a/common/coap-server/src/main/java/org/thingsboard/server/coapserver/TbCoapDtlsSettings.java b/common/coap-server/src/main/java/org/thingsboard/server/coapserver/TbCoapDtlsSettings.java
index 56705b5608..f98dc7d3c6 100644
--- a/common/coap-server/src/main/java/org/thingsboard/server/coapserver/TbCoapDtlsSettings.java
+++ b/common/coap-server/src/main/java/org/thingsboard/server/coapserver/TbCoapDtlsSettings.java
@@ -66,7 +66,7 @@ public class TbCoapDtlsSettings {
     @Value("${coap.dtls.retransmission_timeout:9000}")
     private int dtlsRetransmissionTimeout;
 
-    @Value("${coap.dtls.connection_id_length:}")
+    @Value("${coap.dtls.connection_id_length:8}")
     private Integer cIdLength;
 
     @Value("${coap.dtls.max_transmission_unit:1024}")
diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/config/LwM2MTransportServerConfig.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/config/LwM2MTransportServerConfig.java
index c1af8f553a..bf65b95dd2 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/config/LwM2MTransportServerConfig.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/config/LwM2MTransportServerConfig.java
@@ -43,7 +43,7 @@ public class LwM2MTransportServerConfig implements LwM2MSecureServerConfig {
     private int dtlsRetransmissionTimeout;
 
     @Getter
-    @Value("${transport.lwm2m.dtls.connection_id_length:}")
+    @Value("${transport.lwm2m.dtls.connection_id_length:8}")
     private Integer dtlsCidLength;
 
     @Getter
diff --git a/transport/coap/src/main/resources/tb-coap-transport.yml b/transport/coap/src/main/resources/tb-coap-transport.yml
index f40a09c753..2f3942f847 100644
--- a/transport/coap/src/main/resources/tb-coap-transport.yml
+++ b/transport/coap/src/main/resources/tb-coap-transport.yml
@@ -193,7 +193,7 @@ coap:
     # - A value of 0 means we accept using CID but will not generate one for foreign peer (enables support but not for incoming traffic).
     # - A value between 0 and <= 4: SingleNodeConnectionIdGenerator is used
     # - A value that are > 4: MultiNodeConnectionIdGenerator is used
-    connection_id_length: "${COAP_DTLS_CONNECTION_ID_LENGTH:}"
+    connection_id_length: "${COAP_DTLS_CONNECTION_ID_LENGTH:8}"
     # Specify the MTU (Maximum Transmission Unit).
     # Should be used if LAN MTU is not used, e.g. if IP tunnels are used or if the client uses a smaller value than the LAN MTU.
     # Default = 1024
diff --git a/transport/lwm2m/src/main/resources/tb-lwm2m-transport.yml b/transport/lwm2m/src/main/resources/tb-lwm2m-transport.yml
index 0895bfa676..323f80b999 100644
--- a/transport/lwm2m/src/main/resources/tb-lwm2m-transport.yml
+++ b/transport/lwm2m/src/main/resources/tb-lwm2m-transport.yml
@@ -173,7 +173,7 @@ transport:
       # - A value of 0 means we accept using CID but will not generate one for foreign peer (enables support but not for incoming traffic).
       # - A value between 0 and <= 4: SingleNodeConnectionIdGenerator is used
       # - A value that are > 4: MultiNodeConnectionIdGenerator is used
-      connection_id_length: "${LWM2M_DTLS_CONNECTION_ID_LENGTH:}"
+      connection_id_length: "${LWM2M_DTLS_CONNECTION_ID_LENGTH:8}"
     server:
       # LwM2M Server ID
       id: "${LWM2M_SERVER_ID:123}"