MongoDB: Missing `&ssl=true` leads to `Error: unexpected end of file` on multi hostname connection string

I have a multi hostname connection string like mongodb://user:[e-mail]:27017,cluster0-shard-00-01.bsdflt.mongodb.net:27017,cluster0-shard-00-02.bsdflt.mongodb.net:27017/test?retryWrites=true&w=majority&authSource=admin. Using it with Prisma Client leads to this error message:

$ ts-node ./script.ts
PrismaClientInitializationError: 
Invalid `client.user.deleteMany()` invocation in
/home/runner/work/e2e-tests/e2e-tests/databases/mongodb-atlas-sharded/script.ts:7:21

   4 
   5 // A `main` function so that we can use async/await
   6 async function main() {
→  7   await client.user.deleteMany(
  Database error. error code: unknown, error message: Server selection timeout: No available servers. Topology: { Type: Unknown, Servers: [ { Address: cluster0-shard-00-02.bu2lt.mongodb.net:27017, Type: Unknown, Error: unexpected end of file }, { Address: cluster0-shard-00-01.bu2lt.mongodb.net:27017, Type: Unknown, Error: unexpected end of file }, { Address: cluster0-shard-00-00.bu2lt.mongodb.net:27017, Type: Unknown, Error: unexpected end of file }, ] }
    at cb (/home/runner/work/e2e-tests/e2e-tests/databases/mongodb-atlas-sharded/node_modules/@prisma/client/runtime/index.js:39812:17) {
  clientVersion: '3.10.0-dev.71',
  errorCode: undefined
}
error Command failed with exit code 1.

Adding &ssl=true to the connection string makes the script succeed.

(I got this connection string by manually converting a mongodb+srv one to a normal mongodb one that lists the shards in the hostname with comma separation.)

[janpio]

Open a new issue for this please @moersoy, this one is explicitly for multi hostname connection strings. Thanks.

[moersoy]

Invalid `prisma.account.upsert()` invocation:


Error occurred during query execution:
ConnectorError(ConnectorError { user_facing_error: None, kind: RawDatabaseError { code: "unknown", message: "unexpected end of file" } })

MONGO_DATABASE_URL="mongodb+srv://username:[e-mail]/hyperdrive?retryWrites=true&w=majority&ssl=true"

I’m getting this error even though there is only one hostname connection. This error usually appeared when the number of instant connections was high.

“@prisma/client”: “4.5.0”, node:16-alpine, Google CloudRun