If you’re developing for SharePoint 2010 the Application Pool has a setting called Ping Maximum Response Time with a default value of 90 seconds. In effect, this means that debugging your Web Part, Page, etc. in SharePoint 2010 will only work for 90 seconds and then you get this:
![Debugger terminated by IIS](/blogs/vandest/Media/Windows-Live-Writer/SharePoint-2010-Increase-debugging-time-_F919/image_5.png)
You can increase the value of Ping Maximum Response Time in the Application Pool Settings in IIS:
![AppPool Ping Settings](/blogs/vandest/Media/Windows-Live-Writer/SharePoint-2010-Increase-debugging-time-_F919/image_8.png)
You can also increase the value for future Application Pools via Set Application Pool Defaults (see Actions menu):
![Set Application Pool Defaults](/blogs/vandest/Media/Windows-Live-Writer/SharePoint-2010-Increase-debugging-time-_F919/image_14.png)