Error: 500 when add service from ArcGIS Server 10.6

[MohammadOmar]

iam trying to add service layer from arc gis server 10.6  to portal 10.6 

As https:

failed to load resource the server responded with a status of 500() ArcGIS server 10.6

if I use to add it as HTTP

 it  gives me error failed to load features 

layers add successfully to content but nothing appeared in the web map 

[JakeSkinner]

Hi Mohammad,

If you go to your REST Services Directory, are you able to access the service there?  Can you query or view it through the REST Services directory?

[MohammadOmar]

Hi Jake,

when making query no it take a long time without any responses and i tried to restart server and services but nothing happened 

[JakeSkinner]

Seems like something is wrong with ArcGIS Server.  Is there anything reported in the ArcGIS Server logs (ArcGIS Server Manager > Logs tab > Query)?

[MohammadOmar]

Dear Jake, 

i tried to restart the server machine and now query work on local server but still, have the same problem while trying to add service to webmap in portal 

[JakeSkinner]

Click F12 on your keyboard and click on the Console tab.  Then try adding the layer to your web map.  Are there any errors reported in the console?

[MohammadOmar]

no no errors but now i restart portal server two and it works correctly but I can`t understand why this happens it`s not logic to me .

[MohammadOmar]

really many thanks for your help, Jake.

[ChadKopplin]

Mohammad, did you upgrade your server install or did you uninstall the previous version and then add a fresh install of ArcGIS 10.6?  Here is a help that sounds familiar to this:  https://community.esri.com/thread/208548-error-500-upgrade-1051-to-106-arcgis-server 

[MohammadOmar]

not its first installation (fresh install)