Connections getting closed

Hi,
We have set up weblogic with connection pool as 30 min, 50 max amnd increment
5.So even as the weblogic is started 30 connections are created in the database(Oracle).But
after some time the no. of connections in Oracle gradually comes down from 30
to reach 8.
We checked the idle time for that particular DB user.it is unlimited.
What could be the reason for this?.Should any parameter be changed in such a way
that the oracle connections do not go below 30.
Regards
Vaidy

Oracle must be ending inactive sessions. you should be ok if you have
testConnectionsOnReserve set to true. If you want to make sure the
connections are kept alive for prolonged time when DB times them out, you
should set refresh minutes to a value little lower than the DBs inactive
connection timeout value.
sree
"vaidy" <[email protected]> wrote in message
news:3c79e42c$[email protected]..
Hi,
We have set up weblogic with connection pool as 30 min, 50 max amnd
increment
5.So even as the weblogic is started 30 connections are created in the
database(Oracle).But
after some time the no. of connections in Oracle gradually comes down from
30
to reach 8.
We checked the idle time for that particular DB user.it is unlimited.
What could be the reason for this?.Should any parameter be changed in such a
way
that the oracle connections do not go below 30.
Regards
Vaidy

Similar Messages

TCP Socket connection in CLOSE_WAIT status and not getting closed

I am facing an issue with the TCP socket connections not getting closed and they are in CLOSE_WAIT status for ever.
As a part of batch process in our application, emails are sent with 4 embedded images. These images are downloaded from 3rd party site with IP say "UUU.XXX.YYY.ZZZ"
The images are embedded to email as follows
1. An URL object is created with the site url.
URL urlPhoto = new
URL("http://UUU.XXX.YYY.ZZZ/email/photos.jpg");
2.     The image cid is created with the URL object and the image name
HtmlEmail htmlEmail = new HtmlEmail();
String cid1 = htmlEmail.embed(urlPhoto,
"photo.jpg");
3.     The image cid is added to the email template by replacing the ${cid1} and the email is sent.
<td valign="top">
               <img src="cid:${cid1}" width="279" height="274">
          </td>
When a mail is sent, 4 new TCP connections are opened and are put in CLOSE_WAIT status for ever. For every mail sent 4 new connections are opened. In UNIX there is an upper limit on the number of open file handles (defaults to 1024) at any point of time. The open TCP connection has the underlying socket in CLOSE_WAIT status and is not getting closed at all. When the upper limit (1024) is reached the batch process is throwing the following exception and terminates.
Caused by: com.inet.tds.ap: java.net.SocketExceptionjava.net.SocketException: Too many open files
at com.inet.tds.am.a(Unknown Source)
at com.inet.tds.TdsDriver.a(Unknown Source)
at com.inet.tds.TdsDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at com.hcomemea.batchprocess.dataaccess.database.BaseJdbcDao.openConnection(BaseJdbcDao.java:106)
... 12 more
When I run the command lsof in UNIX which list the open file handles in the system
$ /usr/sbin/lsof -p 22933 -i | grep CLOSE_WAIT
java 22933 build_master 297u IPv6 129841943 TCP integration.com:47929->UUU.XXX.YYY.ZZZ:http (CLOSE_WAIT)
java 22933 build_master 298u IPv6 129841947 TCP integration.com:47933->UUU.XXX.YYY.ZZZ:http (CLOSE_WAIT)
java 22933 build_master 299u IPv6 129841950 TCP integration.com:47936->UUU.XXX.YYY.ZZZ:http (CLOSE_WAIT)
java 22933 build_master 300u IPv6 129841970 TCP integration.com:47952->UUU.XXX.YYY.ZZZ:http (CLOSE_WAIT)
��list of 935 connections similarly�
I tried 2 solutions
1. Got the HttpURLConnection from the URL object and invoked disconnect method on the same. But it doesn�t work.
2. Ran the batch process java program with the parameter �Dhttp.keepAlive=false to close the underlying connection but didn�t help.
I need the underlying sockets to be closed and not put in CLOSE_WAIT status after sending the mail.
Is it the problem with the embed method of HtmlEmail object not closing the underlying socket connection.
If anyone has faced this issue before, kindly let me know the possible solutions for the same ASAP.
Thank you,
Ramesh G

This sounds more like a problem due to connection pooling at middle tier/application server.
If that has been ruled out, then you might to enable DCD or set expiry time on the server.

Getting "The underlying connection was closed: An unexpected error occurred on a receive." in Azure Web Jobs

I have created one web job - on demand schedule under azure web site. This web jobs contains .execmd(i.e.)
Console Application.
I am retrieving the data from SQL Azure database and uploaded the data in sharepoint online lists. (i.e.)I have uploaded the data to several(7) lists in each subsites. I have 3 subsites.
I am getting this error "The underlying connection was closed: An unexpected error occurred on a receive.", while uploaded the data into lists.
Full Error Message:
Message - The underlying connection was closed: An unexpected error occurred on a receive.
StackTrace - at System.Net.HttpWebRequest.GetResponse()
> cc525c: INFO] at Microsoft.SharePoint.Client.SPWebRequestExecutor.Execute()
> cc525c: INFO] at Microsoft.SharePoint.Client.ClientRequest.ExecuteQueryToServer(ChunkStringBuilder sb)
> cc525c: INFO] at Microsoft.SharePoint.Client.ClientRequest.ExecuteQuery()
> cc525c: INFO] at Microsoft.SharePoint.Client.ClientRuntimeContext.ExecuteQuery()
> cc525c: INFO] at Microsoft.SharePoint.Client.ClientContext.ExecuteQuery()
This is not occur every time. Some time i didn't get any error data successfully uploaded in share point online list.
Totally 4 hours taken uploaded the data into list for completed all 3 subsites.
If anyone know how to resolve this.
Thanks,
A.Ramu

I have created one web job - on demand schedule under azure web site. This web jobs contains
.exe cmd(i.e.) Console Application.
I am retrieving the data from SQL Azure database and uploaded the data in sharepoint online lists. (i.e.)I have uploaded the data to several(7) lists in each subsites. I have 3 subsites.
I am getting this error "The remote server returned an error: (503) Server Unavailable", while uploaded the data into lists.
Full Error Message:
Message - The remote server returned an error: (503) Server Unavailable.
StackTrace - at System.Net.HttpWebRequest.GetResponse()
> cc525c: INFO] at Microsoft.SharePoint.Client.SPWebRequestExecutor.Execute()
> cc525c: INFO] at Microsoft.SharePoint.Client.ClientRequest.ExecuteQueryToServer(ChunkStringBuilder sb)
> cc525c: INFO] at Microsoft.SharePoint.Client.ClientRequest.ExecuteQuery()
> cc525c: INFO] at Microsoft.SharePoint.Client.ClientRuntimeContext.ExecuteQuery()
> cc525c: INFO] at Microsoft.SharePoint.Client.ClientContext.ExecuteQuery()
This is not occur every time. Some time i didn't get any error data successfully uploaded in share point online list.
Totally 4 hours taken uploaded the data into list for completed all 3 subsites.
If anyone know how to resolve this.
Thanks,
A.Ramu

Is there any way to identify the particular socket connection is closed ?

Is there any way to identify the particular socket connection is closed or not ?
Any methods ???
How can the program knows the connection is lost or some thing ...
Is the socket throws some excpetions when there is no active connection ???
namanc

If you get an IOException when you try to use the socket, the connection was obviously closed.
The correct way for an application to know if the socket was closed is:
1) the server sends a message indicating that the socket should be closed
2) the client closes the socket itself

"Connection is closed" closed error while using MS Access database

We are using MS Access database in our project. Recently the database was upgraded to 2000.
After upgrading the database, I get the folowing error when getAutoCommit() is called on a connection -
java.sql.SQLException: Connection is closed
at sun.jdbc.odbc.JdbcOdbcConnection.validateConnection(Unknown Source)
at sun.jdbc.odbc.JdbcOdbcConnection.getAutoCommit(Unknown Source)
The connection is not closed explicity before getAutoCommit() is called, only the statement is closed.
This error is sporadic and occurs under load scenario only (when a lot of connections are open). Once the error occurs, all the database calls fail then onwards. The error was not occuring before the database was upgraded.
I suspect the jbdc-odbc driver. The driver might not be compatible with Access2000 database. Under load scenario, it might be closing connections automatically.
Has anybody faced similar problem before? Where can I find the compatible jdbc-odbc driver? And how to ensure that it is jdbc-odbc driver problem only?
The database verison - MS Access 2000
Java version - 1.3.1_01

can i just point out that there is no support for transactions in Access so I wonder why you are calling autoCommit methods at all...

I lose the connection when closing the CMD

Hi guys,
I have configured a standalone listener as following:
C:\Program Files (x86)\Java\jre6\bin> java -Dapex.home=D:\list -Dapex.images=C:\images -jar D:\apex.war
Afterward,
If I close the CMD, I will lose the connection, and I have to reconfigure it again.
If I open APEX locally , I mean by using the shortcut "Get Started With Oracle Database 11g Express Edition" , Then I will lose the connection that uses the default port of the listener, that is 8080.
After I configured the listener I got this message on the CMD
-- listing properties --
PropertyCheckInterval=60
ValidateConnection=true
MinLimit=1
MaxLimit=10
InitialLimit=3
AbandonedConnectionTimeout=900
MaxStatementsLimit=10
InactivityTimeout=1800
MaxConnectionReuseCount=1000
APEX Listener version : 1.1.2.131.15.23
APEX Listener server info: Grizzly/1.9.18-o
May 21, 2011 5:14:41 PM com.sun.grizzly.Controller logVersion
INFO: Starting Grizzly Framework 1.9.18-o - Sat May 21 17:14:41 GST 2011
INFO: http://localhost:8080/apex started.
Using JDBC driver: Oracle JDBC driver version: 11.2.0.2.0
Regards,

Hi,
I'm not sure I got your question right, but I'll try to find some solution anyway.
If I close the CMD, I will lose the connection, and I have to reconfigure it again.That's what happens when a shell is terminated - all associated processes will stop as well. However, if you have a apex-config.xml in your apex.home you shouldn't need to configure your APEX Listener each time your start it, but it would reuse an existing configuration.
If I open APEX locally , I mean by using the shortcut "Get Started With Oracle Database 11g Express Edition" , Then I will lose the connection that uses the default port of the listener, that is 8080.Now, if you have XE running on the same (local) machine as you have your APEX Listener running in standalone mode, you probably have a port conflict: By default, both APEX Listener in standalone mode and the Embedded PL/SQL Gateway (EPG) use port 8080. The EPG is activated as web server for APEX in XE after a fresh installation, the APEX Listener would be an alternative in that case. You can either stop the EPG, or reconfigure any of the two web servers to use a different port, if you want to run them parallel.
To change the port used by the APEX Listener in standalone mode, you simply add another parameter to the startup: -Dapex.port=8888 and you're done.
To change the port used by the EPG, connect as sys and run the following
EXEC DBMS_XDB.SETHTTPPORT(8888);
COMMIT;If you want to disable the EPG, simply set the port to *0* .
After I configured the listener I got this message on the CMDThat's what it should look like.
No, since your topic is "lose the connection when closing the CMD", I assume you search for an alternative. You could run the APEX Listener as a Windows service, even in standalone mode. To do this, you create a batch file, e.g.
%JAVA_HOME%\java -Dapex.home=D:\oracle\APEX_Listener\_home -Dapex.images=D:\oracle\apex_4_0_2\images -Dapex.port=8888 -jar D:\oracle\APEX_Listener\apex_listener.1.1.2.131.15.23\apex.war >>D:\oracle\APEX_Listener\apex_listener.1.1.2.131.15.23\my_apex_listener.log 2>&1Note that you have to set JAVA_HOME as system property or replace the call with the absolute path to your JDK or make sure the JDK is in your PATH variable.
Of course, you can and should change the other directories as well to fit to your system.
Next, create a Windows service, e.g. using [url https://iain.cx/src/nssm/]NSSM (free) or [url http://support.microsoft.com/kb/137890]SRVANY (MS, non-free), that starts your batch as a windows service.
The command for creating that service using NSSM could look as follows
nssm install APEX_Listener D:\oracle\APEX_Listener\apex_listener.1.1.2.131.15.23\startup.cmdYou can edit the service properties afterwards, e.g. change the start mode from "Automatic" to "On Demand".
I hope this answers your question. If not, please point me into the right direction.
Thanks,
Udo

"Cannot perform operation, connection is closed" with Open MQ 4.4

I am using Sun MQ 4.4 with Glassfish 2.1.1 on Red Hat 5.7.
I am able to install glassfish cluster and all the instances are running fine. But, when I try to send a message to a topic, I get following exception
javax.jms.IllegalStateException: [C4062]: Cannot perform operation, connection is closed.
at com.sun.messaging.jmq.jmsclient.ConnectionImpl.checkConnectionState(ConnectionImpl.java:2468)
at com.sun.messaging.jmq.jmsclient.XAConnectionImpl.createSession(XAConnectionImpl.java:105)
at com.sun.messaging.jms.ra.ConnectionAdapter.createSession(ConnectionAdapter.java:383)
Following is part of the stateless EJB where I am creating the session.
@PostConstruct()
private void init() {
if (connectionFactory == null) {
if (log.isTraceEnabled()) log.trace("Connection factory not set. Retrieving from server context.");
InitialContext ic = new InitialContext();
connectionFactory = (ConnectionFactory) ic.lookup("jms/testConnectionFactory");
if (log.isTraceEnabled()) log.trace("Creating JMS connection.");
connection = connectionFactory.createConnection();
@WebMethod()
public void send(){
Session session = null;
session = connection.createSession(true, Session.SESSION_TRANSACTED);
I am trying to install these on a couple of new machines. Same application works on other machines so I am guessing this is a configuartion issue somewhere on these servers.
My question is what would be a good way to find the cause of this failure.
I have turned on log level to finest for ejb-container, jms, RA through glassfish Admin console, but no useful information.
Also, I don't have the name of the servers in DNS yet. I am using IP address for specifying instances.
Any suggestions ?
Thanks
Vineet

Hi Tom,
I used the demo/helloworld/helloworldmessage.java sample.
By the way, I should add that the broker log contains lines like:
[B1066] Closing [email protected]:2461 because "[B0061]: Client exited without closing connections"
Is this what one would expect for a connection.close() ?
It almost seems that this is happening only when the connection is nulled explicitly or the connection object is destroyed.
One last thing:
I was led down the garden path. The reason for the server being thread starved was that there were indeed connections not being closed/nulled.
Thanks in advance,
Patrice
Edited by: paubry04 on Sep 13, 2007 8:21 AM

The underlying connection was closed: An unexpected error occurred on a receive..Exception.Message - while executing powershell command for sharepoint online site

" +The underlying connection was closed: An unexpected error occurred on a receive..Exception.Message " OR sometimes
"The remote server returned an error: (503) Server Unavailable..Exception.Message"
Getting exception above when performing various operation (site coll creating, group creation, adding users to group) for sharepoint online (Office 365) site using powershell script.
I want to create 3500 site collections using PS script. In-between getting above exception so it will skip one site collection creating and working again. for eg. after creating 11 site coll, script will through above exception and so 12th site coll will
not be create but working fine from 13 and so on...

Remote server seems working to me...any additional check?
if problem with remote server then may be loop to create site provisioning should not start again..Right?
any idea?

DriverManagerXAConnection is not getting closed.Toplink 9.0.4.5 OC4J 10.1.2

DriverManagerXAConnection is not getting closed.
Toplink is acquiring connections from two pools OracleConnectionPooledDataSource
and XAConnectionpool. The connection of PooledDatasource is getting released
but the DriverManagerXAConnection is not getting released.
The oc4j output shows.
[java] null: Releasing connection com.evermind.sql.DriverManagerXAConnection@d042d7 to pool (Pool size: 1)
[java] null: Releasing connection com.evermind.sql.DriverManagerXAConnection@702936 to pool (Pool size: 2)
[java] null: Releasing connection com.evermind.sql.DriverManagerXAConnection@1c0db6a to pool (Pool size: 3)
I saw a thread in oc4j forum
Get and close connections many times in an EJB transaction drains pool
which says that this issue is resolved, but I am using toplink 9045 and oc4j 1012
and the problem still persist, also I cannot find the bug 3330123 which is
mentioned in that link on metalink.
Does toplink uses two different connection pools for reading and writing respectively
when used with External Transaction Controller ?
If yes then how this two different pools be configured.
Any help is appreciated.

Hello,
In the forum posting you mentioned, bug: 3330123 I think was a red herring as it was an internal bug that was never able to be verified.
The post though mentions that a Tar:3793784.996 was opened. This tar was linked to bug:3674906 which was created to deal with the issue that calling ds.getConnection() max-connections*10 times, OC4J throws SQLException (timeout).
The problem was that each getConnection call was returning a new logical connection, even though they would share the same physical connection if in the same transaction context. This was changed so that there is no limit on the number of logical connections.
The release logging messages you are seeing are a left over that doesn't seem to have been looked at as a probelm in the bug. I believe they can be ignored - the logical connections are held on to by the container transaction and will only released when this transaction is commited/rolledback.
As for pooling configuration, I suggest looking at the sessionbean demos that use OC4J as examples of how it should be configured. TopLink will use separate pools for reading/writing if configured.
Best Regards,
Chris Delahunt

SQL Service Broker 2012: the connection was closed by the remote end, or an error occurred while receiving data: '64(The specified network name is no longer available.)'

Anyone can help with the below issue please? Much appreciated.
We have about 2k+ messages in sys.transmission_queue
Telnet to the ports 4022 is working fine.
Network connectivity has been ruled out.
The firewalls are OFF.
We also explicitly provided the permissions to the service account on Server A and Server B to the Service broker end points.
GRANT
CONNECT ON
ENDPOINT <broker> <domain\serviceaccount>
Currently for troubleshooting purposes, the DR node is also out of the Availability Group, which means that we right now have only one replica the server is now a traditional cluster.
Important thing to note is when a SQL Server service is restarted, all the messages in the sys.transmission queue is cleared immediately. After about 30-40 minutes, the errors are continued to be seen with the below
The
connection was
closed by the
remote end,
or an
error occurred while
receiving data:
'64(The specified network name is no longer available.)'

We were able to narrow down the issue to an irrelevant IP coming into play during the data transfer. We tried ssbdiagnose runtime and found this error:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Windows\system32>SSBDIAGNOSE -E RUNTIME -ID 54F03D35-1A94-48D2-8144-5A9D24B24520 Connect to -S <SourceServer> -d <SourceDB> Connect To -S <DestinationServer> -d <DestinationDB>
Microsoft SQL Server 11.0.2100.60
Service Broker Diagnostic Utility
An internal exception occurred: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
P 29830 Could not find the connection to the SQL Server that
corresponds to the routing address tcp://XX.XXX.XXX.199:4022. Ensure the tool is connected to this server to allow investigation of runtime events
The IP that corresponds to routing address is no where configured within the SSB. We are yet unsure why this IP is being referred despite not being configured anywhere. We identified that this IP belongs to one of nodes other SQL Server cluster, which has
no direct relation to the source server. We failed over that irrelevant SQL Server cluster and made another node active and to our surprise, the data from sys.transmission_queue started flowing. Even today we are able to reproduce the issue, if we bring
back this node [XX.XXX.XXX.199] as active. Since, its a high business activity period, we are not investigating further until we get an approved downtime to find the root cause of it.
When we get a approved downtime, we will bring the node [XX.XXX.XXX.199] as active and we will be running Network Monitor, Process Monitor and the SSB Diagnose all in parallel to capture the process/program that is accessing the irrelevant IP.
Once, we are able to nail down the root cause, I will share more information.

OLAP Error:The underlying connection was closed: An unexpected error occure

We have recently installed BPC 51 (SP2). This been working fine for months until yesterday. Now we are getting errors on OLAP Database. Following is the problem description. Any help would be appreciated.
Received error "The underlying connection was closed: An unexpected error occurred on a send." while processing dimension. This message appears during 'Create Dimension' sub step( step 2/5). After this BPC server crashes.
The same error appears while deleting appset during 'Delete OLAP Database' sub step (step 2/4). We are also not able to restore an appset since the process hangs during OLAP Database stage.
Software version: BPC Version 5.0.102 SP2
MS SQL Server 2005
Microsoft SQL Server Management Studio      9.00.3042.00
Microsoft Analysis Services Client Tools      2005.090.3042.00
Microsoft Data Access Components (MDAC)      2000.086.3959.00 (srv03_sp2_rtm.070216-1710)
Microsoft MSXML      2.6 3.0 4.0 5.0 6.0
Microsoft Internet Explorer      6.0.3790.3959
Microsoft .NET Framework      2.0.50727.1433
Operating System      5.2.3790
Thanks

Yes we did that several time, but did not solve the problem.
Finally, we processed all the dimensions, applications, appsets within SQL server studio and the problem is resolved. I am not sure if this would surface again.
Thanks
Edited by: Sankaranarayanan Janakiraman on Jun 19, 2008 8:34 AM

ITunes can't sync. "sendMuxSegment connection was closed"

My iPad 2 can't seem to sync.
I've rebooted the Mac and the iPad several times.
I've check the computer with Disk First Aid and all checks out fine.
I thought it might have something to do with the iPad not being on the latest iOS, so I upgraded to 6.1.3, but iTunes continues to behave the same way.
It is able to get through the backup, and didn't have any issues with teh upgrade to 6.1.3, but as soon as it starts the last step of syncing, it finishes. When I checked the Console application it said:
2013-03-27 8:03:07.632 PM com.apple.usbmuxd[67]: MuxTCPInputSCE received RST for 0x7-[REDACTED]@0xfd130000:49353->0x10020d6a0-MDCrashReportTool/NULL:41729: sendMuxSegment connection was closed
I have the latest XCode installed and am doing ad hoc distribution to my iPad 2. (Not sure if it's relevant.) When I launched XCode after update it started pulling "symbols" from the iPad. Then it, too, threw the same error.
2013-03-27 8:19:28.149 PM com.apple.usbmuxd[67]: MuxTCPInputSCE received RST for 0x7-[REDACTED]@0xfd130000:49543->0x100502850-Xcode/com.apple.dt.Xcode:12034: sendMuxSegment connection was closed
Neither iTunes or XCode created any alerts about the error. Both fail completely silently except for the notation in the Console.
Any help would be great!
Thanks,
Colin
iTunes 11.0.2
Mac OS X 10.8.3
XCode 4.6.1
iPad 2 6.3.1

Resolved.
A few months ago, I enabled some restrictions on the iPad to prevent my son (4) from getting constant requests for in-app purchases, including restricting installing or deleting apps. I assumed this would be limited to someone interacting directly with the iPad, not extend to an iTunes sync session.
Really, Apple? You couldn't spare a little warning: "Please enable app installation on the iPad and re-sync."

SSRS Report Server Could not establish connection. The underlying connection was closed. Could not establish trust relationship for the SSL/TLS Secure channel

Hi
Had to un-install and then re-install MS SQL Server 2012 with SSRS.
After we re-installed we are able to get to the Web Services page but not the Report Server page and get the above error message. We need to use SSL and when we bind the cert in RS Configuration Manager it says it does this successfully on the WebServices
tab. We also do a similar exercise on the ReportServer page.
Any help warmly welcomed :D
Thanks

Hi Rich Whight,
According to your description, after you re-installed SQL Server 2012 with SSRS, you are able to access Web Service URL, but when you tried to access Report Manager URL, the error occurred: The underlying connection was closed. Could not establish trust
relationship for the SSL/TLS Secure channel.
The issue may be caused when the certificate isn't installed correctly in the trusted root for the local computer. To verify and install the certificate, Please refer to the steps blow:
In RsReportServer.config file(default location: C:\Program Files\Microsoft SQL Server\MSRS11.MSSQLSERVER\Reporting Services\ReportServer), change the “SecureConnectionLevel” element value from 0 to 3.
Add correct value to <UrlRoot> element.
Add the same value to the <ReportServerUrl> element as step2.
Go to Microsoft management Console, add the certificate which you use to access the report server under “Trusted Root Certification Authorities”.
For more information about SSL configuration and Managing Trusted Root Certificates, please refer to the following documents:
http://blogs.msdn.com/b/mariae/archive/2007/12/12/ssl-configuration-and-reporting-services.aspx
http://technet.microsoft.com/en-us/library/cc754841.aspx
If you have any more questions, please feel free to ask.
Best Regards,
Wendy Fu

Import manager getting closed while importing

when i am trying to import the excel sheet thru import manager,the import manager is getting closed in the step while it is getting "prepared for importing the records."
Can someone tell me why it is so.

Hi Shifali
some check points to be followed:
1. After connecting to the excel file see in the source preview for blank rows and columns. If existing delete all such empty rows and connect to the file again.
2. If data is in multiple sheets are you using for field for joining the sheets? please ensure that there is atleast 1 field used for joining the sheets.
3. How big is the excel file? Try to import the records in chunks that is split the excel file to contain only say 10k records and connect to smaller files and see if import manager is working fine.
best regards
Ravi

Register-SPWorkflowService error: The underlying connection was closed

I have a three server workflow manager farm. I'm using hardware load balancing across the three servers. I've associated a hostname in DNS with the VIP on the NLB.
When I run Register-SPWorkflowService and point at the hostname for the -WorkflowHostUri parameter, I get the error:
Register-SPWorkflowService The underlying connection was closed An unexpected error occurred on a receive.
If I put that URL into a browser on the SP machine where I'm running this cmdlt, it responds with the correct XML. So I know that the NLB is routing regular http requests to my machines in the quorum.
Also, if I use the actual machine name of one of the three machines in the workflow manager quorum, the cmdlt works.
I know very little about NLB hardware. Is there something I need to tell the guys configuring the NLB to do so that the connection doesn't close?

Yes, I actually had done that before using a host file entry to replace the DNS mapping from the NLB VIP to the IP of one of the machines in the WFM quorum. It worked from the standpoint of registering and SharePoint shows that the farm is "connected". However,
when I go to create an SP 2013 workflow, it still only shows 2010 workflows in the dropdown (in SPD.)
I also put Fiddler on the SharePoint machine that I'm using to register the WFM quorum to SharePoint. It shows that when the register cmdlt is executed, several calls to the
/SharePoint/ web service endpoint are made, initially getting a 401 asking for an authentication, and then after creds are passed, getting a 200. But then a call to
/SharePoint/$Activities is called and a 401 occurs twice, after which the registration cmdlt fails.

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