Question on Transport level acknowledgment

Hi all,
I use an acknowledgment at transport level in a send step of a BPM, to send an IDoc to a R/3 system.
I have seen that when PI sends a lot of IDocs to R/3 from multiple BPMs in a short time, transport acknowledgments are not sent when R/3 receives one IDoc, but they are all sent in the same moment, after a few minutes.
Is there a way to change that and immediatly send transport acknowledgment after receiving an IDoc? Because BPMs wait a long time to continue their processes if there are a lot of them executed in the same time.
Thanks for your help,
Greg

Hi Barry,
Thank you for your reply.
In we20, the processing is set to "Trigger Immediately".
Thx,
Greg

Similar Messages

HTTPS (Transport Level Security)

Hi SDNers,
I have a question regarding securing a SOAP Sender scenario using HTTPS. We are on PI 7.11 and have a SOAP-PI-RFC scenario. I have used a HTTP Sender instead of a SOAP channel to configure the option of 'HTTPS without Client Authentication'. I have generated the WSDL for this and tested successfully using SOAP UI.
But our client needs a SSL certificate for this. As far as I understand SSL certificates are used only for message level security. But here they are OK with just transport level security. Do we need any certificates in this case? Please clarify.
Another question I have is, is there any way of using HTTPS (transport level security) using SOAP Sender adapter? The option of 'HTTPS without Client Authentication' is not available anymore from PI 7.1 SP1 onwards. That is the reason I used a HTTP sender adapter.
Any help is much appreciated <text removed>
Thanks & regards,
Sudheer
Edited by: Matt on Oct 12, 2011 6:49 AM

Hi Abhishek,
I am not able to see that option in the SOAP Sender channel configuration. Besides, the help link from SAP also does not show this option.
Here is the link for EHP1:
http://help.sap.com/saphelp_nwpi711/helpdata/en/48/3555240bea31c3e10000000a42189d/content.htm
and here is the link you gave,
http://help.sap.com/saphelp_nwpi71/helpdata/EN/fc/5ad93f130f9215e10000000a155106/content.htm
Clearly, both are for configuring the sender SOAP channel, but the options are different if you notice.
I am not able to understand where I am going wrong.
Appreciate your quick response.
Regards,
Sudheer

A Transport-level error

Our .net application throws an error when the wireless laptop switches from wireless access point to another inside a building. it seems like SQL is closing the existing connetion without notifying the application which thinks that sqlconnetion is still
in OPEN state. why does SQL close a connection without notifying the application? Our programming team does not want to open and close the connection on each transaction because they think it will slow down the application.
Error:
"A transport-level error has occurred when sending the request to the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.)"

I would expect a disconnect error in such a case.
I don't think SQL Server has a design feature to follow mobile wireless devices.
Threads:
Timeout issue when connection to SQL Server in Wireless environment
Having disconnections with SQL Server using a wireless connection
QUOTE: "Ah, SQL Server connections (and the connection pooling mechanism) are not at
all tolerant of WiFi connections. I suggest you use a replication technology
as exposed by the SQL "Server" Compact Edition and ADO.NET 3.5 Sync
Services. This gives you a local DBMS to work with and connectivity designed
to work over an occasionally (and unreliable) connection."
You may try to adjust the TCP/IP Keep Alive parameter, but no guarantee though.
BOL: "Keep Alive
This parameter (in milliseconds) controls how often TCP attempts to verify that an idle connection is still intact by sending a
KEEPALIVE packet. The default is 30000 milliseconds."
LINK:
http://technet.microsoft.com/en-us/library/ms190771(v=sql.105).aspx
Related thread:
Wireless connections to SQL Databases
Kalman Toth Database & OLAP Architect
SQL Server 2014 Design & Programming
New Book / Kindle: Exam 70-461 Bootcamp: Querying Microsoft SQL Server 2012

RPC Fault at Transport level?

One of our Flash programmers is receiving the following error in Flex when connecting to an external MS-SQL DB server.
"[RPC Fault faultString="A Transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 -- The specified network name is no longer available.)" faultCode="Server.Processing" faultDetail="null"]
Apparently my googlefu is no good today as I've not found anything remotely close yet. Any assistance would be greatly apparectiated.
Thanks

Please see attached images which I have got,
I am using:
Latest BlazeDS + Flex 3.0 plugin.
Server JBoss 4.0.2
I am not getting exactly why this is working so?

A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)

Hi guys
i have problem when i run my windows application exe in windows server 2003
it give me this exception error :
I using sql server 2005
visual studio 2008
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.Data.SqlClient.SqlException: A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error)
at System.Data.SqlClient.TdsParserStateObject.ReadSni(DbAsyncResult asyncResult, TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParserStateObject.ReadNetworkPacket()
at System.Data.SqlClient.TdsParserStateObject.ReadBuffer()
at System.Data.SqlClient.TdsParserStateObject.ReadByte()
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.SqlDataReader.ConsumeMetaData()
at System.Data.SqlClient.SqlDataReader.get_MetaData()
at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)
at Sales.SalesClass.ShowSalesData(String ConnectionString)
at Sales.Form1.timer1_Tick(Object sender, EventArgs e)
at System.Windows.Forms.Timer.OnTick(EventArgs e)
at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
Sales
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: file:///C:/Documents%20and%20Settings/administrator.ALTAWIREADYMIX.000/Desktop/Sales.exe
System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
System.Configuration
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
System.Xml
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll
System.Data
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.Data/2.0.0.0__b77a5c561934e089/System.Data.dll
System.Transactions
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.Transactions/2.0.0.0__b77a5c561934e089/System.Transactions.dll
System.EnterpriseServices
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/WINDOWS/assembly/GAC_32/System.EnterpriseServices/2.0.0.0__b03f5f7f11d50a3a/System.EnterpriseServices.dll
************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.
For example:
<configuration>
<system.windows.forms jitDebugging="true" />
</configuration>
When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.
Why this error show and how to solve it
if possible help me
Why this exception show and how to solve it.
Notes this exception not close my application and not affect in result show but i don't know why it show

The problem can be caused by certain issues of long-running queries, which are reported improperly. Try increasing the timeout:
http://support.microsoft.com/en-us/kb/555938

SQL Exceptions, transport-level errors on SharePoint 2010 App Server

SharePoint 2010 becomes inaccessible 2-3 times per day. It happens at approximately the same times: 8 PM, 1 AM and 1 PM. It is inaccessible for about 3-4 minutes and then comes back on its own.
During the time it is down, we see the following errors in the event viewer on the application server:
EventID: 5586 Task Category: Database -
Unknown SQL Exception 64 occurred. Additional error information from SQL Server is included below.A transport-level error has occurred when receiving results from the server.
(provider: TCP Provider, error: 0 - The specified network name is no longer available.)
EventID: 3 Task Category: None -
.Net SqlClient Data Provider: System.Data.SqlClient.SqlException: A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error:
0 - The specified network name is no longer available.)
EventID: 6398 Task Category: Timer -
The Execute method of job definition Microsoft.Office.Server.Search.Monitoring.HealthStatUpdateJobDefinition (ID f9db48f1-f115-47ab-99b6-552460cbb782) threw an exception. More
information is included below. A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)
EventID: 8086 Task Category: Business Data -
The BDC Service application failed due to a SQL Exception: SQLServer host ums1spd1v. The error returned was: 'A transport-level error has occurred when sending the request to
the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.)'
The SharePoint logs have errors during the same time period saying the same kinds of things: Sql exception raw message: A transport-level error has occurred when receiving results from the server,
The specified network name is no longer available, etc.
Our network administrator has looked at the issue and cannot find any network problems.
He setup a continuous ping from the app server to the database server.
Even during the times these errors are occurring, the app server is still able to reach the database server.
However, you cannot ping the app server itself during this time.
Our database administer cannot find any SQL Server issues.
There are no errors in the event viewer or the SQL logs on the database server.
In Central Admin, we can see that one or two jobs fail with SQL errors during the times these errors take place.
It is almost always the “User Profile Service Application – User Profile Language Synchronization Job” and often the “Health Statistics Updating” or “Crawl Log Report for Search Application Search Service Application”.
These jobs run successfully at many other times during the day.
Is there a good way to tell if the database, network or SharePoint itself is the root of these problems?
The database and network guys say there are no problems in their areas, but all I can find in the SharePoint logs is that it can’t reach the database server.
Thank you for any suggestions you may have!

Since these seem to happen at very specific times, I would run a NetMon trace at that window to capture what is going back and forth (or perhaps the timer service is just unable to reach the SQL server).
Trevor Seward, MCC
Follow or contact me at...
&nbsp&nbsp
This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

Problems and question with Transport

Hi,
I have two questions about transporter tool I cannot solve by myself :
-When Transporting from dev system to quality system, data (result of each KPIs) are also transported. How to avoid that ?
- When Transporting in Production, How to avoid to overriding data already entered by users ?
Thanks in advance
Matt

Matt-
SSM Transporter is not like BW in that there is no delta option for data. When using the Transporter you will transport all the Entry & Approval data with your metadata. SSM Transporter cannot transport subsets of data, other than those specified in the Transporter list.
I am not sure what you are trying to accomplish here, but assuming that you want to upgrade 7.5 in dev and then move that to prod, here is a suggested sequence.
Upgrade DEV to the new SP and transport your PROD data into DEV for testing. You also have to move PAS models as well to make sure that the structure of the models are the same. The PAS models are where your data is going to be. The Entry & Approval data is also carried in the SSM metadata as mentioned above. So when transporting PROD data into DEV select the Delete all data in database before import -YES.
Figuring that your testing will take some time, probably additional data will be loaded in PROD during that time. When you've completed your testing, you will have to find a weekend or some period to take your SSM PROD system offline. When you do that you take the PROD system offline and Transport the data again, so you capture all current data and transport that into your upgrade DEV system ( In DEV when transporting Delete all data in database before import - YES). So now your DEV system is the same as your PROD. If you want to make any quick tests to verify, it's recommended. When confident they are the same-
Now, upgrade your PROD system to the new SP and when complete you can transport the data from DEV back in. Check your system and if it checks out put PROD back online. This ensures your data matches the current sets.
This is the very shorthand version, you still have to do all the steps of backing up customizations and all the other things that go along with installing SPs as specified in the guides.
Regards,
Bob

Sending Transport-level Secured messages to OSB

Hi all,
I'm working with OSB, I created a proxy service to expose a Business Service as HTTP, the Proxy has Transport-level security set with XACMLAuthenticator for a Role. I can test it in the test console perfectly however I don't know how to call it any other way.
I would need to call it from an SCA and from a JSP. I'd like to know how to add the credentials to the message.
Thanks,
Pablo

Hi Pablo,
If it is a WSDL based web-service then you may use SOAPUI (http://www.soapui.org/) to test this service.
I would need to call it from an SCA May I know which type of proxy service you have created and what is the input and output type expected?
and from a JSP. I'd like to know how to add the credentials to the message.http://blogs.oracle.com/mneelapu/2010/09/how_to_serve_html_through_osb.html
Quite a similar implementation could be done to call it from a JSP.
Regards,
Anuj

Transport level - Basic Authentication

Hi,
How do we set transport level basic authentication credentials (username, password) after creating a webservice proxy project. I tried the requestContext, and I think it should be somewhere else, as the service provider is using transport level basic authentication.
Any help or direction is appreciated.
Thank you,
VJ

This worked for me. If this helps anyone-
I closed the existing application. Created a new application, and then created the web service proxy. After which, in the ServiceSoap12BindingQSPortClient commented out the
existing setPortCredentialProviderList(requestContext), and have added the following:
reqContext.put(BindingProvider.USERNAME_PROPERTY,"user");
reqContext.put(BindingProvider.PASSWORD_PROPERTY,"password");
reqContext would be - Map<String, Object> reqContext = ((BindingProvider) sersServiceV3PortType).getRequestContext();, which is generated already.
I would be using this standalone project as a component.
Thanks,
VJ
Edited by: VJ on Jul 27, 2011 9:08 AM

BPM: Application Level Acknowledgements

Hi Friends,
Can any one help me how to make use of Application Level Acknowledgements in Asynchronous Send step. When i set this, if my RFC function has any errors while executing will i get the relevant message. If so how to use that Message...

Hi,
To receive a response, you have to use a synchronous interface. This is an application level response,To my knowledge.
For Asynchronous This might help you
Go to the Integration Builder: Configuration
access by, the design - Environment - Integration Builder
1. Go to Scenarios
2. Create a new Configuration Scenario by rightclick and NEW
3. choose language and save
4. on the left tree choose your created scenario
5. choose Receiverdetermination
6. Enter Service = sender System
7. Choose Interface = your Interface File(Structure) from Design
8. Choose Namespace if not filled
9. create
10. open the new Receiverdetermination
11. tab"Configured Receivers" enter Service = receiving System and maybe a condition
12. save
13. Tab"Configuration Overview for Receiver Determination" open the new Receiver Service. The should be a text like "not defined".
14. click at thew first symbol(Interface Determination) Dropdown and select new
15. go on with create
16. choose Inbound Interface and Mapping
17. save and close
18. Goto ReceiverAgreement and click at NEW from the symbol-line.
19. go on with create
20. enter sender Service and communication channel
21. save, activate
===========
Just check out these links This might help you.
http://help.sap.com/saphelp_nw04/helpdata/en/29/345d3b7c32a527e10000000a114084/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/7b/94553b4d53273de10000000a114084/content.htm
The following link has entire configuration of Receiver XI Adapter (including acknowledgements)
http://help.sap.com/saphelp_nw04/helpdata/en/f4/0a1640a991c742e10000000a1550b0/content.htm
Regards
Agasthuri Doss

Reporting on Custom Surveys to Question and Answer level.

Hello,
We are looking to report against a survey which shows the detail of the Question and Answer in detail. For example in a visit you create a survey saying
Q1) Primary Drink preferred
A) Coke
Q2) Secondary Drink Preferred
A) Pepsi
Q3) Primary Objecction?
A) Too Sweet.
Q4) Secondary Objection?
A) Too Light color
Now can we report against per visit to the detail Question and Answer level of this survey like?
Visit --> Primary Drink --> Secondary Drink --> Primary Objection --> Secondary Objection
001 --> Coke              --> Pepsi                 --> Too Sweet            --> Too light Color.
002 --> Sprite              --> Sierra Mist         --> Not strong             --> Too Sweet.
I saw only like we can report against some scores for a Question or Answer. Is there any way where we can do it at the detail level in reports .
We are currently in SoD 1405. Any direction of help appreciated.
Thank You,
Pavan

Hello Pavan,
The questions and answers descriptions are not possible to display in the reports today.
However, you should use the questions and answers category in order to achieve the report you described.
Basically, you will need to create one question category and one answer category per possible answer / question:
Q1) Primary Drink preferred --> Question Category A
A) Coke   -->    Answer Category 1
B) Sprite -->    Answer Category 2
C) Fanta -->    Answer Category 3
Now if you need an answer with a price, you will use the "Actual Price" standard category, you can directly
use the key figure “ Average Actual Product Price”.
Hope it helps.
Regards,
Gaylord

Transport-level error has occurred...No Process is on the other end of the pipe upon first ExecuteQuery() after successful connect.

I’m running MS SQL Server 2005, Express Edition, SP3 on Windows XP. Local connections only.
In preparation to restore a database, I use IWSQLDMOServer::KillProcesses() to allow the database restore. (IWSQLSMOResore::SQLRestore()) The restore is successful and I appear to be able to connect OK. (No error indication on the
connect) However, the first time I try to use the database via an ExecuteQuery() the call fails and the connection state is changed to Closed. I also get the “Transport-level error has occurred...No Process is on the other end of the pipe” exception.
Closing and restarting the application fixes the problem.
Also, disconnecting and reconnecting twice before the ExecuteQuery() call also fixes the problem.
So, I can hide the problem by connecting twice, but I am hoping there is a better solution.
Walter Eykel

It appers when you connect for the restore process, you are opening a different session than that of the original one, with a different database context.
The first time you try to execute a query, you attempt to use the session that was open BEFORE the KillProcesses() call and therefore was killed. By the time you run the first time, your client is informed that the previous session is no longer available.
In the second time, as your client was informed that the original session was killed, it opens a new one.
Its the same behavior as in SSMS.
As a workaround, you could change your database context of your
current session to a base that wont be restored, call the restore methods, and then switch back to the original database context.

Question on field level help and bookmarking

Hi All
I have a question about field level help and bookmarking fields. I did this before but i can't remember how. Right now, when you click on a field in my help to access our software application the page displays but at the top and not at the exact field description. I don't remember how I did this in my other help files.
Please help me so I can bookmark my field level help to go exactly to my definition on the page and not just the top of the page everytime.
Thanks
Caryn

Hi Martin!
Take a look at these sites which will provide you more information about your problem.
[http://apex-at-work.blogspot.com/2008/10/apex-select-list-with-dynamic-help-text.html|http://apex-at-work.blogspot.com/2008/10/apex-select-list-with-dynamic-help-text.html]
TRICK: Dynamic Item Help Text as Tooltip
[http://apex.oracle.com/pls/otn/f?p=11933:121|http://apex.oracle.com/pls/otn/f?p=11933:121]
Regards,
Tobias
[http://apex-at-work.blogspot.com/]

Question Slide Failure Levels Issue

I have 2 rather large assessments that I need to edit TODAY
UGH! of course! They were originally meant to only give the user 1
attempt at each, and therefore 1 failure level. The question slides
were imported from various projects, and changed to 1 attempt/1
failure level, and various other things were changed about the
formatting. Now, the decision has been made to allow users 3
attempts at each question, and therefore 3 failure levels. When I
make this change, publish & test, the question allows me one
attempt, and continues to the next question!!!
Please help!!
Thanks

We decided to just allow the users to review the quiz, and
leave the questions at 1 attempt/failure level each - at least for
now. Adobe support told me the question slides were corrupted, and
that I could recreate them by inserting new question slides, which
apparently worked for them in the testing. Of course, since I don't
have the time to completely recreate the entire assessment, I have
not done that.

Question on org level values in derived roles

I have a set of derived roles for a retail org.
They have set the org level for the WERKS object to the store number i.e. 0012. in the M_MSEG_LGO, M_MSEG_WMB, and M_MSEG_WWE but set it to "" in the M_MRES_WWA and M_MSEG_WWA. Needless to stay the "" is overiding the site restriction.
My question is, how can they allow store to store transfers and goods issues for other sites but only do POs and goods receipts for their default store?
If the transactions in the role are using the same object, it doesn't seem like it can be done but I am told it can! I can't figure it out. Can anyone assist?
Thanks

If you are talking about straight authorization object ( then your design cannot go with derived role concept )
If your controls are only through the organizational object only then derived role design will help
If its a mix of both standard object + organizational level object derived role will not help you.
Please note
the WERKS is the organization level in your case the plan value is 0012
do not set the values in parent role and also do not populate this value were its "$werks"
what is TCODE you are using ?
Edited by: Franklin Jayasim on Jul 21, 2010 11:45 PM

Question on Transport level acknowledgment

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