The server took too long to respond in D365FO

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Posted on by AdnDalhi

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Hello Dynamics community

A quick question again, i receieve the following error message when i start the application, and i don't know it's related to what exactly.

Any ideas, configurations i have to check ?

Thank you

Server took too long time to respond

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nmaenpaa 101,162 Moderator on at

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The first thing that I would check is the URL that you are using to open the application. Do you have anything extra there after the dynamics.com/ ? If yes, try to remove that and see if it helps.

Is this a dev box? Test system? Prod? Is it working for others or not working for anyone? What changes were made in the system before it stopped working?

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Rahul Mohta 21,032 on at

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what activity were you doing?

if it could be done in batch?

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André Arnaud de Cal... 301,146 Super User 2025 Season 2 on at

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Hi Adax,

Please answer the questions from Nikolaos. If it is a VM which just got started with a minimum of hardware sizing, then indeed this error can occur as it needs caching. Consider monitoring the hardware resources and see if you need to add CPU or memory. Also make sure the VM is running on a fast disk as there is a lot of I/O.

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AdnDalhi 336 on at

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Hi Nikolaos,

This is dev environment,

I've tried the standard URL, when i click on one of modules, i cant access to any module, IIS 503 error appears

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nmaenpaa 101,162 Moderator on at

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503 unavailable means that AOS is not running.

First of all, make sure that you can build your code (all your custom models) succesfully. Once you get a succesful build, do a db sync. After succesful db sync, try to open D365 again. Does it work now?

Also, you did not yet answer to question "What changes were made in the system before it stopped working?" But whatever the answer is, please undo those changes, do a build, db sync and try again.

Eventually, if it feels that fixing it would take more than a couple of hours, I always recommend to deploy a new dev system since it's quicker and therefore cheaper for your company.

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AdnDalhi 336 on at

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Full build + Full DB Sychro done, apparently no errors,

But the problem still persist

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André Arnaud de Cal... 301,146 Super User 2025 Season 2 on at

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Can you check if in Internet Information Services (IIS) the site AOSService is running correctly?

Possibly, you can also search in Windows events for possible more detailed error messages.

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AdnDalhi 336 on at

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Thanks to all of you, a new VM has been created, it's work fine now.

Issue resolved

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