I have been experiencing some issues for quite a while now after I refreshed one of the organisations sandboxes. We are using soap api to push external information into salesforce, but our staging sandbox keeps getting the following error when trying to access it:
Error: INVALID_LOGIN: Invalid username, password, security token; or user locked out.
We tried to generate new passwords, security tokens many times, even new wsdl files, and I also verified that the user is not locked out, but still couldn't access salesforce though api.
Note 1: Using the same password and username though the login portal works perfectly fine.
Note 2: Everything worked fine before the refresh, and the user's profile has all access features enabled.
Would anybody know what might be causing the issue?