# 500 error. No suitable servers found (\`serverSelectionTryOnce\` set)

**URL:** <https://discourse.getcockpit.com/t/500-error-no-suitable-servers-found-serverselectiontryonce-set/1806>\
**Category:** Support\
**Created:** [January 27, 2021, 11:17am UTC](https://discourse.getcockpit.com/t/500-error-no-suitable-servers-found-serverselectiontryonce-set/1806 "2021-01-27T11:17:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Metelyoff](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.getcockpit.com/metelyoff/32/762_2.png) [@Metelyoff](https://discourse.getcockpit.com/u/Metelyoff)\
**Post date:** [January 27, 2021, 11:17am UTC](https://discourse.getcockpit.com/t/500-error-no-suitable-servers-found-serverselectiontryonce-set/1806/1 "2021-01-27T11:17:45Z")

</div>

Plz help! Sometimes (often) get 500 error. I am using kubernetes + mongodb (replicaSet).  
Cockpit version 0.11.2  
Mongo version 4.2.6  
my config.php  
‘database’ =\> [  
‘server’ =\> ‘mongodb://mongo.mongo.svc.cluster.local:27017/cockpitdb?replicaSet=rs0’  
]

 ![image](https://canada1.discourse-cdn.com/flex030/uploads/getcockpit/original/1X/42bda46dd9dd72356de5c2ea520ac8ad8d8d3c03.png)