diff --git a/src/auth/AuthManager.ts b/src/auth/AuthManager.ts
index a9dce8a..77fab8b 100644
--- a/src/auth/AuthManager.ts
+++ b/src/auth/AuthManager.ts
@@ -136,7 +136,17 @@ export class AuthManager {
 
     if (isLoggedIn) {
       if (this.serverType === ServerType.Sas9) {
-        await this.performCASSecurityCheck()
+        const casSecurityCheckResponse = await this.performCASSecurityCheck()
+
+        if (isPublicAccessDenied(casSecurityCheckResponse.result)) {
+          isLoggedIn = false
+
+          return {
+            isLoggedIn,
+            userName: this.userName || '',
+            errorMessage: 'Public access has been denied.'
+          }
+        }
       }
 
       this.loginCallback()
@@ -151,7 +161,7 @@ export class AuthManager {
   private async performCASSecurityCheck() {
     const casAuthenticationUrl = `${this.serverUrl}/SASStoredProcess/j_spring_cas_security_check`
 
-    await this.requestClient.get<string>(
+    return await this.requestClient.get<string>(
       `/SASLogon/login?service=${casAuthenticationUrl}`,
       undefined
     )
@@ -361,3 +371,7 @@ const isLogInSuccess = (serverType: ServerType, response: any): boolean => {
 
   return /You have signed in/gm.test(response)
 }
+
+const isPublicAccessDenied = (response: any): boolean => {
+  return /Public access has been denied/gm.test(response)
+}
diff --git a/src/job-execution/WebJobExecutor.ts b/src/job-execution/WebJobExecutor.ts
index fe52903..24af9a3 100644
--- a/src/job-execution/WebJobExecutor.ts
+++ b/src/job-execution/WebJobExecutor.ts
@@ -187,6 +187,12 @@ export class WebJobExecutor extends BaseJobExecutor {
             { result: jsonResponse, log: res.log },
             extraResponseAttributes
           )
+
+          if (this.isPublicAccessDenied(jsonResponse))
+            reject(
+              new ErrorResponse('Public access has been denied', responseObject)
+            )
+
           resolve(responseObject)
         })
         .catch(async (e: Error) => {
@@ -262,4 +268,8 @@ export class WebJobExecutor extends BaseJobExecutor {
     }
     return uri
   }
+
+  private isPublicAccessDenied = (response: string): boolean => {
+    return /Public access has been denied/gm.test(response)
+  }
 }
diff --git a/src/types/Login.ts b/src/types/Login.ts
index 6239456..5b978bd 100644
--- a/src/types/Login.ts
+++ b/src/types/Login.ts
@@ -5,4 +5,5 @@ export interface LoginOptions {
 export interface LoginResult {
   isLoggedIn: boolean
   userName: string
+  errorMessage?: string
 }