diff --git a/services/web/app/src/Features/Compile/ClsiCookieManager.js b/services/web/app/src/Features/Compile/ClsiCookieManager.js
index 458c99d96b..4eac9b1adc 100644
--- a/services/web/app/src/Features/Compile/ClsiCookieManager.js
+++ b/services/web/app/src/Features/Compile/ClsiCookieManager.js
@@ -224,12 +224,15 @@ const ClsiCookieManagerFactory = function (backendGroup) {
     )
   }
 
-  async function clearServerId(projectId, userId) {
+  async function clearServerId(projectId, userId, compileBackendClass) {
     if (!clsiCookiesEnabled) {
       return
     }
     try {
-      await rclient.del(buildKey(projectId, userId))
+      await rclient.del(
+        buildKey(projectId, userId, compileBackendClass),
+        buildOldKey(projectId, userId)
+      )
     } catch (err) {
       // redis errors need wrapping as the instance may be shared
       throw new OError(
diff --git a/services/web/app/src/Features/Compile/ClsiManager.mjs b/services/web/app/src/Features/Compile/ClsiManager.mjs
index 3f33b6e6bf..6ac2de7969 100644
--- a/services/web/app/src/Features/Compile/ClsiManager.mjs
+++ b/services/web/app/src/Features/Compile/ClsiManager.mjs
@@ -81,7 +81,8 @@ async function clearClsiServerId(projectId, userId, compileBackendClass) {
       jobs.push(
         NewBackendCloudClsiCookieManager.promises.clearServerId(
           projectId,
-          userId
+          userId,
+          newCompileBackendClass
         )
       )
     }
diff --git a/services/web/test/unit/src/Compile/ClsiCookieManagerTests.js b/services/web/test/unit/src/Compile/ClsiCookieManagerTests.js
index e1991257c1..6198300111 100644
--- a/services/web/test/unit/src/Compile/ClsiCookieManagerTests.js
+++ b/services/web/test/unit/src/Compile/ClsiCookieManagerTests.js
@@ -7,6 +7,7 @@ describe('ClsiCookieManager', function () {
   beforeEach(function () {
     this.redis = {
       auth() {},
+      del: sinon.stub(),
       get: sinon.stub(),
       setex: sinon.stub().resolves(),
     }
@@ -181,6 +182,20 @@ describe('ClsiCookieManager', function () {
     })
   })
 
+  describe('clearServerId', function () {
+    it('should clear both keys', async function () {
+      await this.ClsiCookieManager.promises.clearServerId(
+        this.project_id,
+        this.user_id,
+        'n2d'
+      )
+      this.redis.del.should.have.been.calledWith(
+        `clsiserver:n2d:${this.project_id}:${this.user_id}`,
+        `clsiserver:${this.project_id}:${this.user_id}`
+      )
+    })
+  })
+
   describe('setServerId', function () {
     beforeEach(function () {
       this.clsiServerId = 'server-id'
diff --git a/services/web/test/unit/src/Compile/ClsiManager.test.mjs b/services/web/test/unit/src/Compile/ClsiManager.test.mjs
index edf3903932..e01aac593c 100644
--- a/services/web/test/unit/src/Compile/ClsiManager.test.mjs
+++ b/services/web/test/unit/src/Compile/ClsiManager.test.mjs
@@ -798,7 +798,7 @@ describe('ClsiManager', function () {
         ctx.result = await ctx.ClsiManager.promises.sendRequest(
           ctx.project._id,
           ctx.user_id,
-          {}
+          { compileBackendClass: 'n2d' }
         )
       })
 
@@ -823,7 +823,7 @@ describe('ClsiManager', function () {
       it('should clear the CLSI server id cookie', function (ctx) {
         expect(
           ctx.ClsiCookieManager.promises.clearServerId
-        ).to.have.been.calledWith(ctx.project._id, ctx.user_id)
+        ).to.have.been.calledWith(ctx.project._id, ctx.user_id, 'n2d')
       })
 
       it('should return a success status', function (ctx) {
@@ -1039,7 +1039,7 @@ describe('ClsiManager', function () {
 
       it('should clear the clsi persistance', function (ctx) {
         ctx.ClsiCookieManager.promises.clearServerId
-          .calledWith(ctx.project._id, ctx.user_id)
+          .calledWith(ctx.project._id, ctx.user_id, 'n2d')
           .should.equal(true)
       })
 
@@ -1062,6 +1062,15 @@ describe('ClsiManager', function () {
         await setTimeout(0)
       })
 
+      it('should clear both cookies', function (ctx) {
+        expect(
+          ctx.ClsiCookieManager.promises.clearServerId
+        ).to.have.been.calledWith(ctx.project._id, ctx.user_id, 'c2d')
+        expect(
+          ctx.ClsiCookieManager.promises.clearServerId
+        ).to.have.been.calledWith(ctx.project._id, ctx.user_id, 'n4')
+      })
+
       it('should forward delete request', function (ctx) {
         expect(ctx.FetchUtils.fetchString).to.have.been.calledWith(
           sinon.match(