HTTP Error 503 when trying to browse public facing website

Question

We are facing one issue since yesterday.

Our public facing website is developed on SharePoint 2013

When end user tries to open the website they are getting

HTTP Error 503. The service is unavailable. error

And after 2,3 minutes it's automatically working fine, and then again after some time getting same issues.

May I please know what would be the issues?

No errors in Log files, Application pool is working fine.

Answer 1

503 error is due to AppPool is stopped on the servers. But you are saying that site working fine after 2 to 3 minutes.

• If you have more than 1 WFE then might be one wfe is bad
• if site came back online then it means that app pool recycled.
• Check the Setting of App Pool recycling, if it is set recycle after reach to limit then it will recycle automatically
• Also monitor the traffic on the servers
• Check the Event log for more clue why app pool recyled.