Unable to open the Excel document in browser

Hi,

I have configured excel service in CA, and i started Excel calculated service. but
unable to open the excel document in web browser. getting below error message.

ULS LOG

Excel Services Application Web Front End acbdCritical Unable to reach Excel Calculation Serviceshttp://SHAREPOINT:32843/cc8a18cec8c74085b5ea7e4167b48acc/ExcelService*.asmx. [Session: User: Domain\sp_webapp] 7574e2c9-a664-46e2-9e43-4a3a0f1f290a
04/13/2015 12:04:18.38 w3wp.exe (0x1FA4) 0x0468 Excel Services Application Web Front End accf Medium ServerSession.ProcessWebException:A Web exception during ExecuteWebMethod has occurred for server:http://SHAREPOINT:32843/cc8a18cec8c74085b5ea7e4167b48acc/ExcelService*.asmx, method: GetHealthScore, ex: System.Net.WebException: The remote server returned an error: (503) Server Unavailable. at System.Net.HttpWebRequest.GetResponse() at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout), response: 'System.Net.HttpWebResponse', status ProtocolError, user name: Domain\sp_webapp. 7574e2c9-a664-46e2-9e43-4a3a0f1f290a
04/13/2015 12:04:18.38 w3wp.exe (0x1FA4) 0x0468 Excel Services Application Web Front Endacco Critical There was an error in communicating with Excel Calculation Serviceshttp://SHAREPOINT:32843/cc8a18cec8c74085b5ea7e4167b48acc/ExcelService*.asmx exception: The remote server returned an error: (503) Server Unavailable. [Session: User: Domain\sp_webapp]. 7574e2c9-a664-46e2-9e43-4a3a0f1f290a

I have verified in IIS , excel service related Application pool has started . and unable to recycling, throwing error message not possible

Is it requried to restart the server???