Connection Failed: “Bad Server”

Overview

The “Bad Server” error is generated by DXFeed and indicates an issue related to market data authorization or account usage restrictions.

This error is not caused by DeepChart itself.

Common Causes

This error usually occurs due to one or both of the following reasons:

1. The same DXFeed account is being used on multiple platforms at the same time

2. The Market Data Agreement has not been signed

Cause 1: Account Used on Multiple Platforms Simultaneously

Description

DXFeed allows only one active connection per account.
If you attempt to use the same data feed or account on multiple platforms at the same time, DXFeed will reject the connection and return a “Bad Server” error.

Solution

1. Close the data feed or trading platform where the account is already connected

2. Ensure the account is active on only one platform

3. Restart DeepChart

4. Try connecting again

Cause 2: Market Data Agreement Not Signed

Description

If the Market Data Agreement has not been signed, DXFeed will block access and return a “Bad Server” error.

Solution: Sign the Market Data Agreement

If You Purchased Data Feed Only (DeepChart or DXFeed Website)

• Log in to your data provider’s portal

• Sign the Market Data Agreement

• Select Non-Professional status if applicable

If You Purchased an Account From a Broker or Prop Firm

• Contact your broker or prop firm

• Ask them how to sign or activate the Market Data Agreement for your account

After signing the agreement:

1. Restart DeepChart

2. Reconnect the data feed

Important Notes

• This is a DXFeed authorization issue, not a platform bug

• Only one active session per account is allowed

• Market data agreements must be signed before data access is granted

Prevention Tips

• Do not use the same data feed on multiple platforms simultaneously

• Sign all required market data agreements immediately after account creation

• Confirm agreement status with your broker or data provider if unsure