diff --git a/lib/patches/locationConstraints.ts b/lib/patches/locationConstraints.ts
index f7b984fa5..a131db616 100644
--- a/lib/patches/locationConstraints.ts
+++ b/lib/patches/locationConstraints.ts
@@ -2,13 +2,10 @@ import { URL } from 'url';
 import { decryptSecret } from '../executables/pensieveCreds/utils';
 import { Logger } from 'werelogs';
 
-const CI_CEPH = process.env.CI_CEPH;
-
 export type LocationType =
     | 'location-mem-v1'
     | 'location-file-v1'
     | 'location-azure-v1'
-    | 'location-ceph-radosgw-s3-v1'
     | 'location-scality-ring-s3-v1'
     | 'location-aws-s3-v1'
     | 'location-wasabi-v1'
@@ -49,6 +46,17 @@ export type Location = {
     legacyAwsBehavior: boolean;
 };
 
+function isUnsupportedCephEndpoint(endpoint: unknown): boolean {
+    if (typeof endpoint !== 'string' || endpoint.length === 0) {
+        return false;
+    }
+
+    const normalized = endpoint.toLowerCase();
+    return /(?:^|[^a-z0-9])(ceph|radosgw|rgw)(?:[^a-z0-9]|$)/.test(
+        normalized
+    );
+}
+
 export function patchLocations(
     overlayLocations: OverlayLocations | undefined | null,
     creds: any,
@@ -68,7 +76,7 @@ export function patchLocations(
                 legacyAwsBehavior: Boolean(l.legacyAwsBehavior),
             };
             let supportsVersioning = false;
-            let pathStyle = CI_CEPH !== undefined;
+            let pathStyle = false;
 
             switch (l.locationType) {
             case 'location-mem-v1':
@@ -94,13 +102,22 @@ export function patchLocations(
                     };
                 }
                 break;
-            case 'location-ceph-radosgw-s3-v1':
             case 'location-scality-ring-s3-v1':
                 pathStyle = true; // fallthrough
             case 'location-aws-s3-v1':
             case 'location-wasabi-v1':
                 supportsVersioning = true; // fallthrough
             case 'location-do-spaces-v1':
+                // Ceph support is deprecated/removed from Arsenal.
+                // Keeping this guard to prevent implicit compatibility through
+                // generic S3-compatible location types.
+                if (isUnsupportedCephEndpoint(l.details?.endpoint)) {
+                    log.warn('deprecated ceph endpoint rejected for location type', {
+                        locationType: l.locationType,
+                        endpoint: l.details?.endpoint,
+                    });
+                    return acc;
+                }
                 location.type = 'aws_s3';
                 if (l.details.secretKey && l.details.secretKey.length > 0) {
                     let https = true;
diff --git a/tests/unit/patches/locationConstraints.spec.js b/tests/unit/patches/locationConstraints.spec.js
index 4a58f131d..0c4faae58 100644
--- a/tests/unit/patches/locationConstraints.spec.js
+++ b/tests/unit/patches/locationConstraints.spec.js
@@ -201,41 +201,6 @@ const tests = [
             objectId: 'httpsawsbackendtest',
         },
     },
-    {
-        locationType: 'location-ceph-radosgw-s3-v1',
-        locations: {
-            objectId: 'cephbackendtest',
-            details: {
-                bucketMatch: 'cephbucketmatch',
-                endpoint: 'https://secure.ceph.end.point',
-                accessKey: 'cephs3accesskey',
-                secretKey,
-                bucketName: 'cephbucketname',
-                region: 'us-west-1',
-            },
-        },
-        expected: {
-            details: {
-                awsEndpoint: 'secure.ceph.end.point',
-                bucketMatch: 'cephbucketmatch',
-                bucketName: 'cephbucketname',
-                credentials: {
-                    accessKey: 'cephs3accesskey',
-                    secretKey: decryptedSecretKey,
-                },
-                https: true,
-                pathStyle: true,
-                region: 'us-west-1',
-                serverSideEncryption: false,
-                supportsVersioning: true,
-            },
-            legacyAwsBehavior: false,
-            isTransient: false,
-            sizeLimitGB: null,
-            type: 'aws_s3',
-            objectId: 'cephbackendtest',
-        },
-    },
     {
         name: 'transient enabled',
         locationType: 'location-file-v1',
@@ -295,6 +260,7 @@ const tests = [
 describe('patch location constriants', () => {
     const mockLog = {
         info: () => {},
+        warn: () => {},
     };
 
     tests.forEach(spec => {
@@ -350,4 +316,103 @@ describe('patch location constriants', () => {
             {},
         );
     });
+
+    it('rejects ceph endpoint on aws location type', () => {
+        assert.deepStrictEqual(
+            patchLocations(
+                {
+                    cephAws: {
+                        name: 'cephAws',
+                        objectId: 'ceph-aws-test',
+                        locationType: 'location-aws-s3-v1',
+                        details: {
+                            endpoint: 'https://secure.ceph.end.point',
+                            accessKey,
+                            secretKey,
+                            bucketName: 'bucket',
+                            bucketMatch: true,
+                            region: 'us-east-1',
+                        },
+                    },
+                },
+                { privateKey },
+                mockLog,
+            ),
+            {},
+        );
+    });
+
+    it('rejects radosgw endpoint on aws location type', () => {
+        assert.deepStrictEqual(
+            patchLocations(
+                {
+                    rgwAws: {
+                        name: 'rgwAws',
+                        objectId: 'rgw-aws-test',
+                        locationType: 'location-aws-s3-v1',
+                        details: {
+                            endpoint: 'http://radosgw.example.local',
+                            accessKey,
+                            secretKey,
+                            bucketName: 'bucket',
+                            bucketMatch: true,
+                            region: 'us-east-1',
+                        },
+                    },
+                },
+                { privateKey },
+                mockLog,
+            ),
+            {},
+        );
+    });
+
+    it('does not reject endpoint with rgw as substring of a token', () => {
+        assert.deepStrictEqual(
+            patchLocations(
+                {
+                    nonRgwToken: {
+                        name: 'nonRgwToken',
+                        objectId: 'non-rgw-token-test',
+                        locationType: 'location-aws-s3-v1',
+                        details: {
+                            endpoint: 'https://forgwave.internal',
+                            accessKey,
+                            secretKey,
+                            bucketName: 'bucket',
+                            bucketMatch: true,
+                            region: 'us-east-1',
+                        },
+                    },
+                },
+                { privateKey },
+                mockLog,
+            ),
+            {
+                nonRgwToken: {
+                    type: 'aws_s3',
+                    name: 'nonRgwToken',
+                    objectId: 'non-rgw-token-test',
+                    locationType: 'location-aws-s3-v1',
+                    sizeLimitGB: null,
+                    isTransient: false,
+                    legacyAwsBehavior: false,
+                    details: {
+                        credentials: {
+                            accessKey,
+                            secretKey: decryptedSecretKey,
+                        },
+                        bucketName: 'bucket',
+                        bucketMatch: true,
+                        serverSideEncryption: false,
+                        region: 'us-east-1',
+                        awsEndpoint: 'forgwave.internal',
+                        supportsVersioning: true,
+                        pathStyle: false,
+                        https: true,
+                    },
+                },
+            },
+        );
+    });
 });