diff --git a/configs/310014.yaml.in b/configs/310014.yaml.in
index 997b90f2f..6690ab14d 100644
--- a/configs/310014.yaml.in
+++ b/configs/310014.yaml.in
@@ -213,16 +213,6 @@ nssf:
         port: 7777
         s_nssai:
           sst: 1
-      - addr: 127.0.0.19
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 000080
-      - addr: 127.0.0.10
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 009000
 
 udr:
     sbi:
diff --git a/configs/csfb.yaml.in b/configs/csfb.yaml.in
index 324d1cb95..9c5bc0334 100644
--- a/configs/csfb.yaml.in
+++ b/configs/csfb.yaml.in
@@ -247,16 +247,6 @@ nssf:
         port: 7777
         s_nssai:
           sst: 1
-      - addr: 127.0.0.19
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 000080
-      - addr: 127.0.0.10
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 009000
 
 udr:
     sbi:
diff --git a/configs/open5gs/nssf.yaml.in b/configs/open5gs/nssf.yaml.in
index e6674393d..6fc8d7827 100644
--- a/configs/open5gs/nssf.yaml.in
+++ b/configs/open5gs/nssf.yaml.in
@@ -62,10 +62,52 @@ logger:
 #    sbi:
 #      dev: eth0
 #
+#  <List of avaiable Network Slice Instance(NSI)>
+#
+#  o One NSI
+#   - NRF[http://::1:7777/nnrf-nfm/v1/nf-instances]
+#     NSSAI[SST:1]
+#
+#    nsi:
+#      - addr: ::1
+#        port: 7777
+#        s_nssai:
+#          sst: 1
+#
+#  o Three NSI
+#   1. NRF[http://::1:7777/nnrf-nfm/v1/nf-instances]
+#      S-NSSAI[SST:1]
+#
+#   2. NRF[http://127.0.0.19:7777/nnrf-nfm/v1/nf-instances]
+#      NSSAI[SST:1, SD:000080]
+#
+#   2. NRF[http://127.0.0.10:7777/nnrf-nfm/v1/nf-instances]
+#      NSSAI[SST:1, SD:009000]
+#
+#    nsi:
+#      - addr: ::1
+#        port: 7777
+#        s_nssai:
+#          sst: 1
+#      - addr: 127.0.0.19
+#        port: 7777
+#        s_nssai:
+#          sst: 1
+#          sd: 000080
+#      - addr: 127.0.0.10
+#        port: 7777
+#        s_nssai:
+#          sst: 1
+#          sd: 009000
 nssf:
     sbi:
       - addr: 127.0.0.14
         port: 7777
+    nsi:
+      - addr: ::1
+        port: 7777
+        s_nssai:
+          sst: 1
 
 #
 # nrf:
diff --git a/configs/sample.yaml.in b/configs/sample.yaml.in
index aee674721..6525b13fd 100644
--- a/configs/sample.yaml.in
+++ b/configs/sample.yaml.in
@@ -213,17 +213,6 @@ nssf:
         port: 7777
         s_nssai:
           sst: 1
-      - addr: 127.0.0.19
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 000080
-      - addr: 127.0.0.10
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 009000
-
 udr:
     sbi:
       - addr: 127.0.0.20
diff --git a/configs/srslte.yaml.in b/configs/srslte.yaml.in
index fc739c6ac..f4690c7ad 100644
--- a/configs/srslte.yaml.in
+++ b/configs/srslte.yaml.in
@@ -213,16 +213,6 @@ nssf:
         port: 7777
         s_nssai:
           sst: 1
-      - addr: 127.0.0.19
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 000080
-      - addr: 127.0.0.10
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 009000
 
 udr:
     sbi:
diff --git a/configs/volte.yaml.in b/configs/volte.yaml.in
index 70e715d24..719306ba8 100644
--- a/configs/volte.yaml.in
+++ b/configs/volte.yaml.in
@@ -218,16 +218,6 @@ nssf:
         port: 7777
         s_nssai:
           sst: 1
-      - addr: 127.0.0.19
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 000080
-      - addr: 127.0.0.10
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 009000
 
 udr:
     sbi:
diff --git a/configs/vonr.yaml.in b/configs/vonr.yaml.in
index b83eb769b..bc28a0352 100644
--- a/configs/vonr.yaml.in
+++ b/configs/vonr.yaml.in
@@ -218,16 +218,6 @@ nssf:
         port: 7777
         s_nssai:
           sst: 1
-      - addr: 127.0.0.19
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 000080
-      - addr: 127.0.0.10
-        port: 7777
-        s_nssai:
-          sst: 1
-          sd: 009000
 
 udr:
     sbi:
diff --git a/src/amf/context.c b/src/amf/context.c
index 7078caec5..99a14749c 100644
--- a/src/amf/context.c
+++ b/src/amf/context.c
@@ -123,7 +123,7 @@ static int amf_context_validation(void)
     if (ogs_list_first(&self.ngap_list) == NULL &&
         ogs_list_first(&self.ngap_list6) == NULL) {
         ogs_error("No amf.ngap in '%s'", ogs_app()->file);
-        return OGS_RETRY;
+        return OGS_ERROR;
     }
 
     if (self.num_of_served_guami == 0) {
diff --git a/src/nssf/context.c b/src/nssf/context.c
index 5fba9a0ec..62678a357 100644
--- a/src/nssf/context.c
+++ b/src/nssf/context.c
@@ -66,6 +66,11 @@ static int nssf_context_prepare(void)
 
 static int nssf_context_validation(void)
 {
+    if (ogs_list_first(&self.nsi_list) == NULL) {
+        ogs_error("No nssf.nsi in '%s'", ogs_app()->file);
+        return OGS_ERROR;
+    }
+
     return OGS_OK;
 }