Looking for logging into the Soap site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Soap site. After that you can login as usual with your login credentials.
https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_calls_login.htm
https://developer.salesforce.com/docs/atlas.en-us.api_asynch.meta/api_asynch/asynch_api_quickstart_login.htm
https://developer.salesforce.com/forums/?id=9060G0000005WCAQA2
https://www.soapui.org/soap-and-wsdl/authenticating-soap-requests.html
https://soaptreatmentstore.com/customer/account/login
https://help.bronto.com/bmp/concept/c_api_soap_login.html
https://auth0.com/learn/rest-vs-soap/
https://www.soapvault.com/login
https://www.youtube.com/watch?v=y9ma9G7Cwz0
https://community.jaspersoft.com/documentation/jasperreports-server-web-services-guide/v56/soap-authentication
https://stackoverflow.com/questions/2737685/how-to-do-authentication-using-soap
https://knowledgecenter.zuora.com/DC_Developers/G_SOAP_API/E_SOAP_API_Calls/login_call/Log_in_to_the_SOAP_API
https://www.ibm.com/support/knowledgecenter/en/SS7J8H/com.ibm.odm.cloud.integrating/topics/con_invocation.html