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Ivaylo BalabanovIvaylo Balabanov 

Problem SOAP API

Hello,

I have an apllication which use SOAP API and from yesterday i got
System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---> System.IO.IO
  Exception: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. --->
  
  System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond


from time to time. Is there any problem with Salesforce API?

Regards,
Ivo 
Daniel BallingerDaniel Ballinger
Are you calling out to a third party SOAP API, or are you calling into an API hosted by Salesforce?

Either way, the first place to check is http://trust.salesforce.com/trust/instances. This will tell you if there were any service disruptions on your instance at the time the problem occured.

After that, what is your API call doing? E.g. Is it running a SOQL query?