Its been 6 months we are getting Error 103 from karnataka bank .. any one else facing this?

Let me help you get past the error code, vinay3. 

The Error 103 occurs when credentials entered into QuickBooks Online don’t match with what your financial institution has. I'd suggest accessing your bank's website outside QuickBooks to see if you can login without issues.

The following are the primary reasons why you receive an Error 103: 

• You have entered the wrong credentials while trying to connect to your financial institution for the first time.
• You have selected the wrong financial institution (there are often many to select from).
• If you are currently connected and you’ve updated your credentials with your financial institution, you need to update the information in QuickBooks Online. 

1.  Log in to your bank’s website outside QuickBooks. 
2.  Review your posted transactions and check for any connectivity error notifications.
3. Once completed, log in to your QuickBooks Online account. 
4. Let’s perform a manual update on your connected bank account.

          a. Go to the Banking menu.

          b. Choose the Banking tab.

          c. Select your bank account.

          d. Click Update.

          e. If prompted, enter your Multi-Factor Authentication (MFA) credentials.

          f. Click the Continue update button.

You can read through this article for more insights about the new Open Banking process: Fix banking error 103 in QuickBooks Online.  

If you can’t still find or connect to your bank, refer to this article: What to do if you can’t find downloaded transactions in QuickBooks Online.

Please keep me posted on the outcome. I look forward to your response on this, as I want to ensure you're all taken care of. Have a great day!