WSO2 API Manager Connection Error , "Error occurred while sending the HEAD request to the given endpoint url"

ncgamer99 0
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I'm trying to configure the WSO2 API Manager. (version - v4.0.0) When I try to create REST API and point to the endpoints I"m getting a Connection error message for the given endpoints. I have hosted the API Manager and the back end services on the same server(backend services are running on the tomcat application on the same server in port 8080)

API Manager Log produces the following message :

ERROR {org.wso2.carbon.apimgt.rest.api.publisher.v1.impl.ApisApiServiceImpl} - Error occurred while sending the HEAD request to the given endpoint url: org.apache.commons.httpclient.ConnectTimeoutException: The host did not accept the connection within timeout of 4000 ms

would really like to what has caused the issue.

P.S: I can access the backend services directly without any connection issues using a REST client.enter image description here

wso2-appm wso2-api-manager java wso2 rest
1 Answers

It's difficult to answer the question without knowing the exact details of your deployment and the backend. But let me try. Here is what I think is happening. As you can clearly see, the error is a connection timeout The host did not accept the connection within timeout of 4000 ms.

Let me explain what happens when you click on the Check Endpoint Status button. When you click on the Check Endpoint Status button, the Browser is not directly sending a request to the Backend to validate it. The Backend URL will be passed to the APIM Server, and the Server will perform the validation by sending an HTTP HEAD request to the BE service.

So there can be two causes. First may be your backend doesn't know how to handle a HEAD request which is preventing it from accepting the request. But given the error indicated it's a network issue, I doubt it even reached the BE.

The second one is, that your Backend is not accessible from the place API Manager is running. If you are running API Manager on Server A and trying to access API Manager via browser from Server B(Local Machine). Although you can access the BE from Server B may be from Server A it's not accessible. When I say BE is not accessible from API Manager server, it means it's not accessible with the same URL that was used in API Manager. It doesn't really matter if it runs in the same Server if you are using a different DNS other than localhost to access it. So go to the server API Manager is running and send a request using the same URL that was used in API Manager and see whether it's accessible from there.

ycr0
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