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iiswebserverplotly-dashiis-10

Dash App on IIS Webserver Timing Out with HTTP500 SC258 Error

I have ISS Server hosting Dash app.

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What I am noticing in the browser is that app starts but doesn't return anything back. Looking at the HTTP logs, it shows HTTP 500 error with sc-win32-status 258. Timetaken value from HTTP logs is around 100seconds.

There are HTTP 200 with same time taken value...so that tells me its not only timeout issue. I didn't change the default timeout value in IIS (which I think is more than 5 mins?)

Trying to figure out what is causing this intermittent timeout issue.

Thanks!

Solution

  • The issue was in the timeout duration in IIS > FastCGI Settings > Process Model > Activity Timeout. The operation was taking long time then it was set to communication with IIS.

    Increasing the timeout to 180seconds seemed to fix the issue for me.