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Issue with "invalid_grant" errors in iMIS

(edited)

Client is experiencing a number of the red There was a problem loading this area errors in RiSE, primarily on the checkout/cart pages (at least, that's when they complain the most). The only "fix" is to recycle the app pools and/or the server. It seems to happen at random days and times, and not related to busy traffic. The error from the event viewer is:

ERROR Asi.Web.UI.UserControlBase [(null)] - FaultException1: SecurityFault: { "error":"invalid_grant","error_description":"The user name or password is incorrect."} Request URL: /Members/Store/StoreLayouts/Cart_Home.aspx

ERROR Asi.Web.UI.UserControlBase [(null)] - FaultException1: SecurityFault: {; "error":"invalid_grant","error_description":"The user name or password is incorrect."} Request URL: /Members/Cart/Members/Store/StoreLayouts/Cart_Home.aspx

There are no customizations on the cart page nor any preceding page in the process, while the option to pay dues and register is an option 99% of their transactions are events-only.

Client is on version 20.2.64.8807 and is self-hosted, there are no other applications running on the server and it's not a busy site.

Thanks much - anything would be helpful.

(edit, I really am trying to use markdown to make this look better but after 5 edits I gave up)