I've Sitecore instance hosted on Azure according to below breakdown :
- Sitecore 9.1 (each component as standalone App Service)
- Solr 7.2.1 (standalone App Service)
- App insights configured and connected to all provisioned app services.
Suddenly Solr went down and became un available (Getting 503 ERROR)
I was investigating the issue on App Insights (reviewing requests, traces .. etc.) and found below requests are being triggered on SOLR App Service..
Every few minutes, there is a request to access random port on localhost !
Is it really SOLR doing that trials ? or kind of breaches or attacks ?
I'm not able to figure it out .. why this is happening on Solr instance ?