200-level Full Market Depth WebSocket Connection Failed

APIs, Automation, Algos & Code
1

Hi @Hardik @Mohseen_Usmani @Poornima @Kushagra_Rohatgi @PravinJ

  • Issue: 200-level depth connections fail consistently. 20-level depth works fine on the same account.
    Connection URL tried:

    • wss://full-depth-api.dhan.co/?token=***&clientId=***&authType=2 (SDK root path)

    • wss://full-depth-api.dhan.co/twohundreddepth?token=***&clientId=***&authType=2 (docs path)

  • Both fail identically.
    Subscribe JSON sent after connection:
    {“RequestCode”: 23, “ExchangeSegment”: “NSE_FNO”, “SecurityId”: “40977”}

  • Behavior:

    • WebSocket TCP connection establishes successfully

    • Subscription JSON sent

    • Server resets connection after 3-5 seconds with ResetWithoutClosingHandshake (no data frames received)

    • This repeats on every reconnection attempt (40+ attempts observed)

  • Working comparison: 20-level depth (wss://depth-api-feed.dhan.co/twentydepth) connects and receives data for the same instruments without issues.
    Questions:

    • Is 200-level depth enabled for my account/data plan?

    • Is the 200-level depth server currently operational?

    • Are there specific instruments that support 200-level depth vs not?

2

Hey @Parthiban_Sub

Can you send in your Client ID along with other details on apihelp@dhan.co? We will look into this scenario.

I tried to connect and subscribe to instruments, it is working fine for me. Will check the logs over here.

3

@Hardik - Done. Please check.