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1. IL-0397 Orders on one exchange connection hung in pending states as its NSE leased line failed and the backup line kept flapping

   Zerodha2018

   Symptoms

   On 12 April 2018 at about 12.12 pm, the primary leased line to the NSE exchange on one of Zerodha's CTCLs went down, and the backup leased line that took over went up and down many times over the next 60 minutes. Orders sent through that CTCL were not placed on the exchange and stayed in the states open pending, validation pending and modify pending, leaving a small group of clients with hanging orders and positions.

   Link flapping

   Trigger

   The primary NSE leased line on one CTCL went down at about 12.12 pm, and the backup leased line then flapped repeatedly for about 60 minutes.

   Root cause

   Dependency failure

   Component

   NIC, cable and switch port link

   Contributing factor

   –

   Detection

   Zerodha received emails from the NSE-approved leased line vendor when the lines failed.

   Remediation

   • Shut the affected CTCL down completely so no new orders could go through it
   • Lapsed the orders left in pending states and reconciled them with the exchange

   Action items

   • Release an option to exit bracket and cover orders directly from the open position, even when no counter leg open order is shown

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