iisnode encountered an error when processing the request.

HRESULT: 0x2
HTTP status: 500
HTTP subStatus: 1002
HTTP reason: Internal Server Error

You are receiving this HTTP 200 response because system.webServer/iisnode/@devErrorsEnabled configuration setting is 'true'.

In addition to the log of stdout and stderr of the node.exe process, consider using debugging and ETW traces to further diagnose the problem.

The last 64k of the output generated by the node.exe process to stderr is shown below:

❌ Database connection error: ConnectionError [SequelizeConnectionError]: Server requests authentication using unknown plugin auth_gssapi_client. See TODO: add plugins doco here on how to configure or author authentication plugins.
    at ConnectionManager.connect (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\sequelize\lib\dialects\mysql\connection-manager.js:102:17)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async ConnectionManager._connect (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\sequelize\lib\dialects\abstract\connection-manager.js:222:24)
    at async C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\sequelize\lib\dialects\abstract\connection-manager.js:174:32
    at async ConnectionManager.getConnection (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\sequelize\lib\dialects\abstract\connection-manager.js:197:7)
    at async C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\sequelize\lib\sequelize.js:305:26
    at async Sequelize.authenticate (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\sequelize\lib\sequelize.js:457:5)
    at async connectDB (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\config\database.js:28:5)
    at async startServer (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\server.js:130:5) {
  parent: Error: Server requests authentication using unknown plugin auth_gssapi_client. See TODO: add plugins doco here on how to configure or author authentication plugins.
      at Object.authSwitchRequest (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\commands\auth_switch.js:61:11)
      at ClientHandshake.handshakeResult (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\commands\client_handshake.js:196:22)
      at ClientHandshake.execute (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\commands\command.js:45:22)
      at Connection.handlePacket (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\base\connection.js:475:34)
      at PacketParser.onPacket (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\base\connection.js:93:12)
      at PacketParser.executeStart (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\packet_parser.js:75:16)
      at Socket.<anonymous> (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\base\connection.js:100:25)
      at Socket.emit (node:events:517:28)
      at addChunk (node:internal/streams/readable:368:12)
      at readableAddChunk (node:internal/streams/readable:341:9) {
    code: 'AUTH_SWITCH_PLUGIN_ERROR',
    fatal: true
  },
  original: Error: Server requests authentication using unknown plugin auth_gssapi_client. See TODO: add plugins doco here on how to configure or author authentication plugins.
      at Object.authSwitchRequest (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\commands\auth_switch.js:61:11)
      at ClientHandshake.handshakeResult (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\commands\client_handshake.js:196:22)
      at ClientHandshake.execute (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\commands\command.js:45:22)
      at Connection.handlePacket (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\base\connection.js:475:34)
      at PacketParser.onPacket (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\base\connection.js:93:12)
      at PacketParser.executeStart (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\packet_parser.js:75:16)
      at Socket.<anonymous> (C:\Inetpub\vhosts\k5techno.com\shg.freeqrcodes.in\node_modules\mysql2\lib\base\connection.js:100:25)
      at Socket.emit (node:events:517:28)
      at addChunk (node:internal/streams/readable:368:12)
      at readableAddChunk (node:internal/streams/readable:341:9) {
    code: 'AUTH_SWITCH_PLUGIN_ERROR',
    fatal: true
  }
}