SharePoint 2010 Search Error: “Internal server error exception”

Configured SharePoint 2010 Search in a new environment. When trying to search, received: Internal server error exception:” Error! Here are some workarounds:

Troubleshooting

• Restart the SharePoint timer services/ IIS/ SharePoint Search service / Restart Server
• Enable the “Search Server WebParts” feature on the Site Collection level.
• Run the “Search and Process” Timer Job
• Make sure your search service application is associated with the right proxy! (Go to Application Management >> Select Configure service application associations under the Service Application heading >>Select the default Application, select Your service app, Then click on set as default)
• ensure that the “SharePoint Server Search” and “Search Query and Site Settings Service” services are running
• Verify your AAM Settings
• ensuring that the application pool is assigned correctly
• Remove and reinstall the search application
• Install the Hot fix: https://support.microsoft.com/kb/976462