Looking for logging into the Ecp 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 Ecp site. After that you can login as usual with your login credentials.
https://secure.ecp123.com/
https://www.myecp.com/
https://social.technet.microsoft.com/Forums/en-US/a07fa978-81cf-4722-b222-eaa981e680d2/exchange-server-2013-ecp-login%3Fforum%3Dexchangesvrdeploy
https://www.youtube.com/watch%3Fv%3D5BRQ-QGo6Mk
https://electricalcontentportal.trace-software.com/
https://electricalcontentportal.trace-software.com/Page/login.aspx%3FAspxAutoDetectCookieSupport%3D1
https://community.spiceworks.com/topic/2098064-exchange-2013-owa-and-ecp-unable-to-login-no-error-messages
https://www.reddit.com/r/exchangeserver/comments/8pngju/owaecp_login_trouble_exsrv_2016/
https://expert-advice.org/exchange-server/how-to-fix-exchange-20132016-cannot-login-ecp-or-owa-error/
https://www.experts-exchange.com/questions/29113835/cannot-log-into-OWA-or-ECP-login-loop-after-renewing-self-signed-cert-%27Microsoft-Exchange%27.html
https://www.superioroptical.com/ecp/log_in
https://www.opticalprescriptionlab.com/index.php%3Fpage%3Dlog_in%40Customer
https://serverfault.com/questions/559023/exchange-2013-ecp-unable-to-login