IIS Randomly Hanging
in [ASP .NET]
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From: mgdev on 9 Apr 2010 10:53 I need some help on how to troubleshoot IIS Randomly Hanging on my server. Late last year we upgraded our ASP.net (2.0) application with a lot of new features. Now that we've rolled this new version out to many of our customers we're getting complaints about IIS hanging and needing to be restarted. Unfortunately, this hanging is random. After the restart of IIS the application works as expected. We are unable to predictably reproduce this hanging situation. But at some point, anywhere from an hour to a few days, the w3wp.exe will hang again and prevent the system from being used. I have observed this first hand, but as I stated above, after restarting IIS I can't reproduce the problem. We have seen this problem in both IIS6 (Server 2003) and IIS7 (Server 2008). If you have any suggestions on how I can go about troubleshooting or resolving this issue I'd like to know. Please know that this is an urgent matter so if there are any options I can try that would minimize this problem for the short term I'd like to explore that as well.
From: Mark Rae [MVP] on 9 Apr 2010 13:06 "mgdev" <mgdev(a)discussions.microsoft.com> wrote in message news:E750D961-90C9-4FC5-B271-0F7FC0B37891(a)microsoft.com... > We have seen this problem in both IIS6 (Server 2003) and IIS7 (Server > 2008). Which indicates that the problem lies with your app and not IIS per se. In my experience, the problems that you're facing are almost always due to memory leaks. Check that you are disposing objects correctly - do not under any circumstances leave them around for the garbage collector to handle. This is especially true for any unmanaged objects and ADO.NET objects. One simple thing to check is that you are not persisting ADO.NET objects across pages or <shudders> in Session. -- Mark Rae ASP.NET MVP http://www.markrae.net
From: Mr. Arnold on 9 Apr 2010 16:25 mgdev wrote: > I need some help on how to troubleshoot IIS Randomly Hanging on my server. > > Late last year we upgraded our ASP.net (2.0) application with a lot of new > features. Now that we've rolled this new version out to many of our > customers we're getting complaints about IIS hanging and needing to be > restarted. Unfortunately, this hanging is random. After the restart of IIS > the application works as expected. We are unable to predictably reproduce > this hanging situation. But at some point, anywhere from an hour to a few > days, the w3wp.exe will hang again and prevent the system from being used. I > have observed this first hand, but as I stated above, after restarting IIS I > can't reproduce the problem. > > We have seen this problem in both IIS6 (Server 2003) and IIS7 (Server 2008). > > If you have any suggestions on how I can go about troubleshooting or > resolving this issue I'd like to know. Please know that this is an urgent > matter so if there are any options I can try that would minimize this problem > for the short term I'd like to explore that as well. You have memory issues, particularly if everything is inproc, and you have poorly written programs. Memory is being choked, and it's IISreset. I have seen sites do IISresets as the norm 5 times a day, to prevent the hangs.
From: mgdev on 9 Apr 2010 17:14 In general, we do practice disposing of objects. But I'm sure we are not perfect and there could be some left behind. Assuming this is a lack of disposing of objects. Are there any tools that could help me find these objects? The reason I'm asking is, this application is very large (100+ classes plus 100+ aspx pages) and will take a lot of time to go through line by line to find indisposed objects. Please let me know your thoughts. "Mark Rae [MVP]" wrote: > "mgdev" <mgdev(a)discussions.microsoft.com> wrote in message > news:E750D961-90C9-4FC5-B271-0F7FC0B37891(a)microsoft.com... > > > We have seen this problem in both IIS6 (Server 2003) and IIS7 (Server > > 2008). > > Which indicates that the problem lies with your app and not IIS per se. > > In my experience, the problems that you're facing are almost always due to > memory leaks. > > Check that you are disposing objects correctly - do not under any > circumstances leave them around for the garbage collector to handle. This is > especially true for any unmanaged objects and ADO.NET objects. One simple > thing to check is that you are not persisting ADO.NET objects across pages > or <shudders> in Session. > > > -- > Mark Rae > ASP.NET MVP > http://www.markrae.net >
From: Patrice on 9 Apr 2010 17:21 Have you tried to check the event viewer for messages ? It should be always the first step when something goes wrong... See http://msdn.microsoft.com/en-us/library/ms524984.aspx and the "Opening the event viewer" section if needed... -- Patrice "mgdev" <mgdev(a)discussions.microsoft.com> a écrit dans le message de news:E750D961-90C9-4FC5-B271-0F7FC0B37891(a)microsoft.com... >I need some help on how to troubleshoot IIS Randomly Hanging on my server. > > Late last year we upgraded our ASP.net (2.0) application with a lot of new > features. Now that we've rolled this new version out to many of our > customers we're getting complaints about IIS hanging and needing to be > restarted. Unfortunately, this hanging is random. After the restart of > IIS > the application works as expected. We are unable to predictably reproduce > this hanging situation. But at some point, anywhere from an hour to a few > days, the w3wp.exe will hang again and prevent the system from being used. > I > have observed this first hand, but as I stated above, after restarting IIS > I > can't reproduce the problem. > > We have seen this problem in both IIS6 (Server 2003) and IIS7 (Server > 2008). > > If you have any suggestions on how I can go about troubleshooting or > resolving this issue I'd like to know. Please know that this is an urgent > matter so if there are any options I can try that would minimize this > problem > for the short term I'd like to explore that as well.
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