diff --git a/components/apimgt-extensions/org.wso2.carbon.apimgt.handlers/src/main/java/org/wso2/carbon/apimgt/handlers/AuthenticationHandler.java b/components/apimgt-extensions/org.wso2.carbon.apimgt.handlers/src/main/java/org/wso2/carbon/apimgt/handlers/AuthenticationHandler.java
index 8bad3de1a8..5638f3ba58 100644
--- a/components/apimgt-extensions/org.wso2.carbon.apimgt.handlers/src/main/java/org/wso2/carbon/apimgt/handlers/AuthenticationHandler.java
+++ b/components/apimgt-extensions/org.wso2.carbon.apimgt.handlers/src/main/java/org/wso2/carbon/apimgt/handlers/AuthenticationHandler.java
@@ -95,7 +95,7 @@ public class AuthenticationHandler extends AbstractHandler {
                     log.debug("Verify Cert:\n" + mdmSignature);
                 }
                 URI certVerifyUrl = new URI(iotServerConfiguration.getVerificationEndpoint() + "ios");
-                Map<String, String> certVerifyHeaders = this.setHeaders(this.restInvoker);
+                Map<String, String> certVerifyHeaders = this.setHeaders();
 
                 Certificate certificate = new Certificate();
                 certificate.setPem(mdmSignature);
@@ -127,7 +127,7 @@ public class AuthenticationHandler extends AbstractHandler {
 
                 String deviceType = this.getDeviceType(messageContext.getTo().getAddress().trim());
                 URI certVerifyUrl = new URI(iotServerConfiguration.getVerificationEndpoint() + deviceType);
-                Map<String, String> certVerifyHeaders = this.setHeaders(this.restInvoker);
+                Map<String, String> certVerifyHeaders = this.setHeaders();
                 Certificate certificate = new Certificate();
                 certificate.setPem(subjectDN);
                 certificate.setTenantId(tenantId);
@@ -157,7 +157,7 @@ public class AuthenticationHandler extends AbstractHandler {
                 }
                 String deviceType = this.getDeviceType(messageContext.getTo().getAddress().trim());
                 URI certVerifyUrl = new URI(iotServerConfiguration.getVerificationEndpoint() + deviceType);
-                Map<String, String> certVerifyHeaders = this.setHeaders(this.restInvoker);
+                Map<String, String> certVerifyHeaders = this.setHeaders();
 
                 Certificate certificate = new Certificate();
                 certificate.setPem(encodedPem);
@@ -184,9 +184,6 @@ public class AuthenticationHandler extends AbstractHandler {
         } catch (URISyntaxException e) {
             log.error("Error while processing certificate.", e);
             return false;
-        } catch (APIMCertificateMGTException e) {
-            log.error("Error while processing certificate.", e);
-            return false;
         } catch (CertificateException e) {
             log.error("Certificate issue occurred when generating converting PEM to x509Certificate", e);
             return false;
@@ -212,9 +209,9 @@ public class AuthenticationHandler extends AbstractHandler {
         return null;
     }
 
-    private Map<String, String> setHeaders(RESTInvoker restInvoker) throws APIMCertificateMGTException {
+    private Map<String, String> setHeaders() {
         Map<String, String> map = new HashMap<>();
-        String accessToken = Utils.getAccessToken(iotServerConfiguration, restInvoker);
+        String accessToken = Utils.getBase64EncodedToken(iotServerConfiguration);
         map.put(AUTHORIZATION, BEARER + accessToken);
         map.put(CONTENT_TYPE, "application/json");
         return map;
diff --git a/components/apimgt-extensions/org.wso2.carbon.apimgt.handlers/src/main/java/org/wso2/carbon/apimgt/handlers/utils/Utils.java b/components/apimgt-extensions/org.wso2.carbon.apimgt.handlers/src/main/java/org/wso2/carbon/apimgt/handlers/utils/Utils.java
index f149868e76..5be2c18705 100644
--- a/components/apimgt-extensions/org.wso2.carbon.apimgt.handlers/src/main/java/org/wso2/carbon/apimgt/handlers/utils/Utils.java
+++ b/components/apimgt-extensions/org.wso2.carbon.apimgt.handlers/src/main/java/org/wso2/carbon/apimgt/handlers/utils/Utils.java
@@ -135,38 +135,14 @@ public class Utils {
     }
 
     /**
-     * This class get the access token from the key manager.
+     * This method is used to get the base64 encoded token.
      *
      * @param iotServerConfiguration Instance of the IoTsererConfiguration.
      * @return Access token will be returned.
-     * @throws APIMCertificateMGTException
      */
-    public static String getAccessToken(IOTServerConfiguration iotServerConfiguration, RESTInvoker restInvoker)
-            throws APIMCertificateMGTException {
-        try {
-            if (clientId == null || clientSecret == null) {
-                getClientSecretes(iotServerConfiguration, restInvoker);
-            }
-            URI tokenUrl = new URI(iotServerConfiguration.getOauthTokenEndpoint());
-            String tokenContent = "grant_type=password&username=" + iotServerConfiguration.getUsername() + "&password=" +
-                    iotServerConfiguration.getPassword() + "&scope=activity-view";
-            String tokenBasicAuth = "Basic " + Base64.encode((clientId + ":" + clientSecret).getBytes());
-            Map<String, String> tokenHeaders = new HashMap<>();
-            tokenHeaders.put("Authorization", tokenBasicAuth);
-            tokenHeaders.put("Content-Type", "application/x-www-form-urlencoded");
-
-            RESTResponse response = restInvoker.invokePOST(tokenUrl, tokenHeaders, tokenContent);
-            if (log.isDebugEnabled()) {
-                log.debug("Token response:" + response.getContent());
-            }
-            JSONObject jsonResponse = new JSONObject(response.getContent());
-            return jsonResponse.getString("access_token");
-
-        } catch (URISyntaxException | IOException e) {
-            throw new APIMCertificateMGTException("Error occurred while trying to call oauth token endpoint", e);
-        } catch (JSONException e) {
-            throw new APIMCertificateMGTException("Error occurred while converting the json to object", e);
-        }
+    public static String getBase64EncodedToken(IOTServerConfiguration iotServerConfiguration) {
+        return Base64.encode((iotServerConfiguration.getUsername() + ":" + iotServerConfiguration.getPassword()).
+                getBytes());
     }
 
     /**