# 166
source: https://developer.mastercard.com/open-finance-us/documentation/errors/error-codes/166/index.md

This error occurs when a connection to the selected financial institution has encountered an unknown error.

|             Title             |                                                                                                              Details                                                                                                              |
|-------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Error Code**                | 166                                                                                                                                                                                                                               |
| **Remediation Category**      | Retry Later                                                                                                                                                                                                                       |
| **HTTP Status**               | 500                                                                                                                                                                                                                               |
| **Error Type**                | Institution Error                                                                                                                                                                                                                 |
| **Data Connect Alert**        | We ran into a technical issue, try again later or select another institution. (166)                                                                                                                                               |
| **Error Message**             | An error occurred in the financial institution connection. Submitting a [support ticket](https://developer.mastercard.com/open-finance-us/documentation/support/index.md#create-a-support-case-in-scm) is the recommended action. |
| **End User Message**          | We suggest displaying this error message to your end users: "An unexpected error has occurred. Please try again. If the problem persists, contact your administrator."                                                            |
| **Common Causes**             | Connection is interrupted temporarily due to an unexpected error.                                                                                                                                                                 |
| **Troubleshooting Steps**     | Submit a [support ticket](https://developer.mastercard.com/open-finance-us/documentation/support/index.md#create-a-support-case-in-scm).                                                                                          |
| **Data Connect Fix Eligible** | No.                                                                                                                                                                                                                               |
| **Retriable by End User**     | No.                                                                                                                                                                                                                               |
| **Access to Latest Data**     | You will be unable to access the latest data for this user's account until the issue is resolved.                                                                                                                                 |

[Full Error List](https://developer.mastercard.com/open-finance-us/documentation/errors/error-list/index.md) \| [Institution Errors](https://developer.mastercard.com/open-finance-us/documentation/errors/institution-errors/index.md)