Hi,

We are a Premier Account User in GoogleAppEngine. We have two front-end 
servers running on Google AppEngine developed using Java.

Front-end server A communicates with another front-end server B using 
URLFetch(java.net) request.

We have set the maximum connectionTimeOut and readTimeOuts (60000ms) also 
for URLFetch in server A.

All the requests from server A to B works successfully 70% of the time. 

But we are finding weird scenarios like 30% of the time where server A 
would have given URLFetch request to Server B and throwing 
java.net.SocketTimeoutException: Timeout while fetching URL.

Note: The request from Server A to B remains dead air for 60 seconds and 
there aren't any request being received at Server B for the same. There are 
no instance restarts on both the servers.

But when the client retries the request again, it runs successfully.

We have 2 idle instances and instance classes configured to F4 on both the 
servers.

Can we please know why the request from Server A timeouts out without a 
request being received at the other server end (ie) Server B?

Thanks.

Regards,
Anantha Krishnan

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