Occasional SOAP errors when making web service calls from C#

We have a C# application making web service calls to RFCs (non-NCO, SAP 4.7, WAS 6.40) and occasionally getting the following error:
The 'SOAP-ENV:Envelope' start tag on line '1' does not match the end tag of 'SOAP-ENV:Envel'. Line 1, position 34560.
This error happens randomly and can occur, not occur, and occur again for the exact same call (same data, same web service call). I anticipate that we might have a missing configuration on one of our application servers, but don't know where to tell BASIS to look. Any ideas or other help would be appreciated.

That's going to be difficult. The random nature of the error makes it impossible to reproduce (so far) in our Development and Test environments. Since the error is coming from the SAP side, I believe I would need a sniffer on each production application server in order to try to catch this and that would result in some very large log files. Is there any log file or other SAP transaction that might already be capturing these failures?

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Errors when processing web service call

Hello Experts,
Based on a requirement, I got a URL based on WSDL, using which I created a Consumer Proxy in SAP.
I created a Logical Port in SOA Manager with type selected as 'WSDL'.
When I'm trying to execute the proxy class to call the webservice using the logical port through SE80 it is throwing an error log as stated below.
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3)Error when calling SOAP Runtime functions: Unexpected element -el=definitions ns=http://schemas.xmlsoap.org/wsdl/
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Thanks,
Vamshi

Hi,
Check Anton's reply in this thread: External WS Consumption Issue
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Calling WebServices from ABAP via HTTPS
Regards,
Kiran

Making Web Service calls from a Form in the WorkSpace

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Error when processing web service call

Hello Experts,
Based on a requirement, I got a URL based on WSDL, using which I created a Consumer Proxy in SAP.
I created a Logical Port in SOA Manager with type selected as 'WSDL', and didnot gave any authentication id or password in it.
When I'm trying to execute the proxy class to call the webservice using the logical port, it is asking me a prompt for Userid and Password, and when I press enter, it is throwing an error log as stated below.
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Thanks,
Mallik

Unsupported xstream found: ("HTTP Code 401 : Unauthorized")
Unsupported xstream means response received from service provider (host) is NOT in valid xml format (usually HTML). You will see this type of error when host or service you are trying to call return HTML (error pages etc).
HTTP Code 401 : Unauthorized : Clearly means that user/password for service provider is incorrect
[Click here|http://en.wikipedia.org/wiki/List_of_HTTP_status_codes] to understand all HTTP code
I am closing this thread, if you have any question post new question in forum.
Regards,
Gourav

Error while making Web service call

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Thanks for the Response Raj.
I already followed the same instructions in the Links.
When SharePoint Autodisover.svc webservice send a request to Exchange server & Exchange server redirecting that request to different server, this is the problem i am facing right now.
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user13046122 wrote:
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Occasional SOAP errors when making web service calls from C#

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