diff --git a/packages/system/seaweedfs/Makefile b/packages/system/seaweedfs/Makefile
index cf43956f2..af7c7b327 100644
--- a/packages/system/seaweedfs/Makefile
+++ b/packages/system/seaweedfs/Makefile
@@ -18,5 +18,6 @@ update:
 	patch --no-backup-if-mismatch -p4 < patches/cosi-provisioner-sa-name.patch
 	patch --no-backup-if-mismatch -p4 < patches/cosi-bucket-class-lock-readonly.patch
 	patch --no-backup-if-mismatch -p4 < patches/s3-service-name.patch
+	patch --no-backup-if-mismatch -p4 < patches/s3-service-name-consumers.patch
 	#patch --no-backup-if-mismatch -p4 < patches/retention-policy-delete.yaml
 
diff --git a/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-deployment.yaml b/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-deployment.yaml
index d485e0678..d581b085d 100644
--- a/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-deployment.yaml
+++ b/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-deployment.yaml
@@ -79,9 +79,9 @@ spec:
               {{- else if .Values.s3.ingress.enabled }}
               value: "{{ printf "https://%s" .Values.s3.ingress.host }}"
               {{- else if .Values.s3.enabled }}
-              value: "{{ printf "https://%s.%s.svc" (include "seaweedfs.componentName" (list . "s3")) .Release.Namespace }}"
+              value: "{{ printf "https://%s-s3.%s.svc:%v" (include "seaweedfs.name" .) .Release.Namespace .Values.s3.port }}"
               {{- else }}
-              value: "{{ printf "https://%s.%s.svc" (include "seaweedfs.componentName" (list . "filer")) .Release.Namespace }}"
+              value: "{{ printf "https://%s-s3.%s.svc:%v" (include "seaweedfs.name" .) .Release.Namespace .Values.filer.s3.port }}"
               {{- end }}
             {{- with .Values.cosi.region }}
             - name: REGION
diff --git a/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-iceberg-ingress.yaml b/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-iceberg-ingress.yaml
index 5a760d7e9..68db538dc 100644
--- a/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-iceberg-ingress.yaml
+++ b/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-iceberg-ingress.yaml
@@ -5,11 +5,11 @@ paths:
   backend:
     {{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion }}
     service:
-      name: {{ include "seaweedfs.componentName" (list . "s3") }}
+      name: {{ template "seaweedfs.name" . }}-s3
       port:
         number: {{ .Values.s3.icebergPort }}
     {{- else }}
-    serviceName: {{ include "seaweedfs.componentName" (list . "s3") }}
+    serviceName: {{ template "seaweedfs.name" . }}-s3
     servicePort: {{ .Values.s3.icebergPort }}
     {{- end }}
 {{- end -}}
diff --git a/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-ingress.yaml b/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-ingress.yaml
index bc4eee164..c92063f8c 100644
--- a/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-ingress.yaml
+++ b/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-ingress.yaml
@@ -2,7 +2,7 @@
 {{- $s3Enabled := or .Values.s3.enabled (and .Values.filer.s3.enabled (not .Values.allInOne.enabled)) (and .Values.allInOne.enabled .Values.allInOne.s3.enabled) }}
 {{- if and $s3Enabled .Values.s3.ingress.enabled }}
 {{- /* Determine service name based on deployment mode */}}
-{{- $serviceName := ternary (include "seaweedfs.componentName" (list . "all-in-one")) (include "seaweedfs.componentName" (list . "s3")) .Values.allInOne.enabled }}
+{{- $serviceName := ternary (include "seaweedfs.componentName" (list . "all-in-one")) (printf "%s-s3" (include "seaweedfs.name" .)) .Values.allInOne.enabled }}
 {{- $s3Port := .Values.allInOne.s3.port | default .Values.s3.port }}
 {{- /* Build hosts list - support both legacy .host (string) and new .hosts (array) for backwards compatibility */}}
 {{- $hosts := list }}
diff --git a/packages/system/seaweedfs/patches/s3-service-name-consumers.patch b/packages/system/seaweedfs/patches/s3-service-name-consumers.patch
new file mode 100644
index 000000000..73b09dc15
--- /dev/null
+++ b/packages/system/seaweedfs/patches/s3-service-name-consumers.patch
@@ -0,0 +1,47 @@
+diff --git a/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-deployment.yaml b/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-deployment.yaml
+index d485e0678..d581b085d 100644
+--- a/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-deployment.yaml
++++ b/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-deployment.yaml
+@@ -79,9 +79,9 @@ spec:
+               {{- else if .Values.s3.ingress.enabled }}
+               value: "{{ printf "https://%s" .Values.s3.ingress.host }}"
+               {{- else if .Values.s3.enabled }}
+-              value: "{{ printf "https://%s.%s.svc" (include "seaweedfs.componentName" (list . "s3")) .Release.Namespace }}"
++              value: "{{ printf "https://%s-s3.%s.svc:%v" (include "seaweedfs.name" .) .Release.Namespace .Values.s3.port }}"
+               {{- else }}
+-              value: "{{ printf "https://%s.%s.svc" (include "seaweedfs.componentName" (list . "filer")) .Release.Namespace }}"
++              value: "{{ printf "https://%s-s3.%s.svc:%v" (include "seaweedfs.name" .) .Release.Namespace .Values.filer.s3.port }}"
+               {{- end }}
+             {{- with .Values.cosi.region }}
+             - name: REGION
+diff --git a/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-iceberg-ingress.yaml b/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-iceberg-ingress.yaml
+index 5a760d7e9..68db538dc 100644
+--- a/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-iceberg-ingress.yaml
++++ b/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-iceberg-ingress.yaml
+@@ -5,11 +5,11 @@ paths:
+   backend:
+     {{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion }}
+     service:
+-      name: {{ include "seaweedfs.componentName" (list . "s3") }}
++      name: {{ template "seaweedfs.name" . }}-s3
+       port:
+         number: {{ .Values.s3.icebergPort }}
+     {{- else }}
+-    serviceName: {{ include "seaweedfs.componentName" (list . "s3") }}
++    serviceName: {{ template "seaweedfs.name" . }}-s3
+     servicePort: {{ .Values.s3.icebergPort }}
+     {{- end }}
+ {{- end -}}
+diff --git a/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-ingress.yaml b/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-ingress.yaml
+index bc4eee164..c92063f8c 100644
+--- a/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-ingress.yaml
++++ b/packages/system/seaweedfs/charts/seaweedfs/templates/s3/s3-ingress.yaml
+@@ -2,7 +2,7 @@
+ {{- $s3Enabled := or .Values.s3.enabled (and .Values.filer.s3.enabled (not .Values.allInOne.enabled)) (and .Values.allInOne.enabled .Values.allInOne.s3.enabled) }}
+ {{- if and $s3Enabled .Values.s3.ingress.enabled }}
+ {{- /* Determine service name based on deployment mode */}}
+-{{- $serviceName := ternary (include "seaweedfs.componentName" (list . "all-in-one")) (include "seaweedfs.componentName" (list . "s3")) .Values.allInOne.enabled }}
++{{- $serviceName := ternary (include "seaweedfs.componentName" (list . "all-in-one")) (printf "%s-s3" (include "seaweedfs.name" .)) .Values.allInOne.enabled }}
+ {{- $s3Port := .Values.allInOne.s3.port | default .Values.s3.port }}
+ {{- /* Build hosts list - support both legacy .host (string) and new .hosts (array) for backwards compatibility */}}
+ {{- $hosts := list }}
diff --git a/packages/system/seaweedfs/tests/s3_service_name_consumers_test.yaml b/packages/system/seaweedfs/tests/s3_service_name_consumers_test.yaml
new file mode 100644
index 000000000..628d2713b
--- /dev/null
+++ b/packages/system/seaweedfs/tests/s3_service_name_consumers_test.yaml
@@ -0,0 +1,100 @@
+suite: seaweedfs s3 consumers resolve the renamed s3 service
+
+# Pins the regression where consumers of the S3 service 503 / fail to connect
+# because they still resolve a service name that no longer exists.
+#
+# The s3-service-name.patch renamed the S3 Service to `<name>-s3` (seaweedfs-s3),
+# but several consumers still resolved it via componentName -> `<fullname>-s3`:
+#   - the S3 ingress backend,
+#   - the iceberg ingress backend,
+#   - the COSI provisioner ENDPOINT (in-cluster, s3.ingress.enabled=false path).
+# name and fullname only coincide when the release name equals the chart name;
+# the shipped release is `seaweedfs-system`, so those consumers pointed at
+# `seaweedfs-system-s3` while the real service is `seaweedfs-s3`. With no
+# matching endpoints, ingress-nginx returns 503 and COSI cannot reach S3.
+#
+# All tests render under the real release name so name != fullname, the exact
+# condition that exposes the bug. The all-in-one case documents the other
+# ternary branch, which is unchanged and correct.
+
+templates:
+  - charts/seaweedfs/templates/s3/s3-service.yaml
+  - charts/seaweedfs/templates/s3/s3-ingress.yaml
+  - charts/seaweedfs/templates/s3/s3-iceberg-ingress.yaml
+  - charts/seaweedfs/templates/cosi/cosi-deployment.yaml
+
+release:
+  name: seaweedfs-system
+  namespace: cozy-seaweedfs
+
+tests:
+  - it: s3 service is named with the name helper, not componentName
+    template: charts/seaweedfs/templates/s3/s3-service.yaml
+    set:
+      seaweedfs.s3.enabled: true
+    asserts:
+      - equal:
+          path: metadata.name
+          value: seaweedfs-s3
+
+  - it: s3 ingress backend points at the s3 service, not a fullname-derived name
+    template: charts/seaweedfs/templates/s3/s3-ingress.yaml
+    set:
+      seaweedfs.s3.enabled: true
+      seaweedfs.s3.ingress.enabled: true
+      seaweedfs.s3.ingress.host: s3.example.com
+    asserts:
+      - equal:
+          path: spec.rules[0].http.paths[0].backend.service.name
+          value: seaweedfs-s3
+
+  - it: all-in-one ingress backend still resolves to the all-in-one service
+    template: charts/seaweedfs/templates/s3/s3-ingress.yaml
+    set:
+      seaweedfs.allInOne.enabled: true
+      seaweedfs.allInOne.s3.enabled: true
+      seaweedfs.s3.ingress.enabled: true
+      seaweedfs.s3.ingress.host: s3.example.com
+    asserts:
+      - equal:
+          path: spec.rules[0].http.paths[0].backend.service.name
+          value: seaweedfs-system-all-in-one
+
+  - it: iceberg ingress backend points at the s3 service too
+    template: charts/seaweedfs/templates/s3/s3-iceberg-ingress.yaml
+    set:
+      seaweedfs.s3.enabled: true
+      seaweedfs.s3.icebergPort: 8334
+      seaweedfs.s3.icebergIngress.enabled: true
+      seaweedfs.s3.icebergIngress.host: iceberg.example.com
+    asserts:
+      - equal:
+          path: spec.rules[0].http.paths[0].backend.service.name
+          value: seaweedfs-s3
+
+  - it: COSI in-cluster ENDPOINT resolves the s3 service when ingress is disabled
+    template: charts/seaweedfs/templates/cosi/cosi-deployment.yaml
+    set:
+      seaweedfs.cosi.enabled: true
+      seaweedfs.s3.enabled: true
+      seaweedfs.s3.ingress.enabled: false
+    asserts:
+      - contains:
+          path: spec.template.spec.containers[0].env
+          content:
+            name: ENDPOINT
+            value: https://seaweedfs-s3.cozy-seaweedfs.svc:8333
+
+  - it: COSI in-cluster ENDPOINT (filer S3 mode) targets the s3 service on the filer s3 port
+    template: charts/seaweedfs/templates/cosi/cosi-deployment.yaml
+    set:
+      seaweedfs.cosi.enabled: true
+      seaweedfs.s3.enabled: false
+      seaweedfs.filer.s3.enabled: true
+      seaweedfs.s3.ingress.enabled: false
+    asserts:
+      - contains:
+          path: spec.template.spec.containers[0].env
+          content:
+            name: ENDPOINT
+            value: https://seaweedfs-s3.cozy-seaweedfs.svc:8333