Recently, a challenge arose with a client’s SSIS packages occasionally failing. They received the following error:Description: “Login timeout expired”.An OLE DB record is available. Source: “Microsoft SQL Server Native Client 11.0” Hresult: 0x80004005 Description: “A network-related or instance-specific error has occurred while establishing a connection to SQL Server.
Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information, see SQL Server Books Online.”After reviewing possible reasons for this occurrence, we determined the issue was network-related. I checked for a ‘Connect Timeout’ setting in the connection string and noticed that it was not specified.
This means that it was set to the default setting, 15 seconds. We recommended they set the ‘Connect Timeout’ high enough to account for any network hiccups. To my surprise, the client responded that they initially set the ‘Connect Timeout’ in the Visual Studio’s connection manager to 0 per their documentation. Setting the ‘Connect Timeout’ to 0 gives the SSIS package an unlimited amount of time to attempt connection. This should have displayed in the connection string and prevented the error they received.
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This was not the case. I decided to attempt to duplicate their problem.All testing was done in Microsoft Visual Studio 2015 Update 3. The instances and databases used are on XTIVIA test servers.I started by creating a simple OLE DB connection through the connection manager. Pms composition paper 2017. So far, no problems.The issue occurred when I went to the ‘All’ tab.
Though ‘Connect Timeout’ was set to 15 seconds by default, there was a 0 in the space next to it.It registered as being null when saved, and ‘Connect Timeout’ was not specified in the connection string.In this example, the resulting connection string was as followed: Data Source=;Initial Catalog=Test;Provider=SQLNCLI11.1;Integrated Security=SSPI;Auto Translate=False;I ran the test SSIS package I created and duplicated the timeout error they received.The setting falsely registers as null if a number higher than 0 is not specified. Because of this, it only presents a problem if the goal is to set the ‘Connect Timeout’ setting to unlimited. The Connection Manager WorkaroundOur team does not usually recommend having the connection timeout set to unlimited.
This causes the SSIS package to continue to use resources until the command can complete. If there are multiple SSIS package jobs and the server is unavailable for an extended period, this could cause the SSIS package jobs to pile up until the server becomes available. Nonetheless, I wanted to find a way to set it 0 in case it was necessary. After numerous tests, I identified a workaround which did not involve manually setting the connection string or setting up a configuration file. Step 1: Set the ‘Connect Timeout’ Setting to Any ValueAs shown in the image below, I set the timeout to 1 minute, in seconds.Once I clicked ‘OK’, it generated two following connection strings, as predicted:Data Source=;Initial Catalog=Test;Provider=SQLNCLI11.1;Integrated Security=SSPI;Connect Timeout=60;Auto Translate=False;Step 2: Change the ‘Connect Timeout’ Setting to 0I re-opened the connection manager for.
Test and changed the ‘Connect Timeout’ setting to 0.I again clicked ‘OK’ and saved the package.
In the config file of a.net application I have this key used to store a connection string:I'm under the impression that 'Connect Timeout=0' means 'take as long as you need to connect'.If I publish that web site to a Windows 2008 R2 (web) server running IIS 7.5 which connects to a separate server running SQL Server 2008 - the web site stops responding whenever more than 2 people are browsing it.If I open the web site in a browser, move to the desk next to mine and open it on someone else's PC - it will work fine. If I move to a third PC and try to open the web site in a browser - the browser just hangs - nothing happens. There are no error messages and nothing is raised in the server event logs.I know absolutely by a process of elimination that it is the connection to the database that is causing the problem. If I remove all code on my home page that retrieves data from the database - the site works perfectly with any number of people able to browse it.If I change it to 'Connect Timeout=15' it seems to fix the problem (so far, at least). So, my question is. Does 'Connect Timeout=0' mean 'take as long as you like to connect to the database' or not? What else can it mean - you surely can't expect a connection to be instantaneous?.
ALZDBA (8/17/2011)Regarding more than 2 users:- does your app use locking hints?No locking hints are used. The database in question is used by 6 separate applications. They all run on a Windows 2003 server running IIS 6 - and were developed using VS2005 and use.net Framework 2.0The big difference with this (the 7th) application is that it has been developed in VS2010 and uses.net Framework 4.0 and is hosted on a Windows 2008 R2 server running IIS 7.5The code in the 7th application - in terms of the Data Access class - all the log in stuff etc. Secret world the 3rd age. is all identical to the code in the other 6 apps. The main difference is that each app accesses its own tables and has its own stored procedures. Otherwise, everything is the same.Thanks for your reply. Roy Ernest (8/17/2011)Just one question, by any chance is it running under debug mode?
That is the only thing that comes to mind.No, at least I say 'no' but it's a fast paced and pretty lax development environment - in that whilst the systems are being developed for each team, mods to the app are published to the live server quite frequently. And, yes, there may be times where I forget to change. And it gets published to live with debug='true'. But, not in this case.As I say, I regularly publish live and forget to change debug to false - I've never noticed any issues before.
Iis Connection Time Out Unlimited Time
You find this affects things to a noticeable extent?. I have the same issue.Able to reproduce in SSMS by changing the connection timeout = 0. SSMS just sits there forever.We are able to say it is DB Server related as it is only happening to a couple of our servers but not to others.
We are not able to change anything on those servers as the admin are not on our team.:) I have been looking into the pooled connections documentation to see if we could find anything. But as we only have 1/2 day to find an issue solution. We had to change the connection timeout to 180.:(. Cowering in corner forever.
When working with ARR deployments one of the errors you might see is 502.3 Bad Gateway. The 502.3 means while acting as a proxy ARR was unable to complete the request to the upstream server and subsequently send a response back to the client. This can happen for multiple reasons including, failure to connect to the server, no response from the server, or server took too long to respond (time out).For the purposes of this post we are going to look at a timeout error and the data that can be gathered to help isolate the cause.If you are looking at this post then you probably have already seen this error or something similar.
This is shown in the browser when are enabled in IIS.Another way to identify the source of the 502.3 is with logs in IIS configured to capture Status code 502.From the message the key details are the ErrorCode which you can use to map to to the Winhttp error message, which in this case is ERRORWINHTTPTIMEOUT ( ). You will also see in the next line that this is translated to “The operation timed out”. Note that both the 0x80072ee2 and map to the same error ERRORWINHTTPTIMEOUT.Now that we know its a timeout we need to determine what type of timeout occurred. IIS logs on the Content Server:Examine the IIS logs on the content server and check the sc-status and sc-win32-status and time-taken fields. This will give you an idea of whether the request processed successfully ( sc-status = 200) and the time-taken to see if this exceeds your ARR timeout and if this is the expected execution time for your web page. You can determine from this whether you need to troubleshoot a long running application or simply increase the ARR timeout settings. Checking the Win32 field for errors such as 1236 (ERRORCONNECTIONABORTED) or 64 (ERRORNETNAMEDELETED) indicate that something happened on the network layer such as a connection reset.Using our example the IIS logs here show that the Request took 35 seconds (time-taken=35615), the request was processed successfully on the server (sc-status=200), but there was a problem sending the request (sc-win32-status=64) which means the connection was gone when the content server tried to send the request.
Iis Default Timeout
This was because the client (ARR) has already timed-out and closed the TCP connection. #Software: Microsoft Internet Information Services 7.0#Version: 1.0#Date: 2010-06-23 20:11:33#Fields: date time cs-method cs-uri-stem s-port sc-status sc-substatus sc-win32-status time-taken2010-06-23 20:11:33 GET /sleep/ default.aspx 80 200 0 64 35615SummarySo in this case we can see that the request took 35 seconds which is longer than the default timeout in ARR.
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