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Tran_Hoa_Binh's avatar
Tran_Hoa_Binh
Copper Contributor
Oct 28, 2021

Problems authencation many times on Outlook Express

Dear all
I have problems on OE 2010, 2013, 2016, O365 ...
I have tried the following ways:
- Search Credential Manager in the search bar Windows Credentials Delete all the Microsoft credentials Add a generic credential called Outlook and add the username/password that will be used.
- Change new password and create a new user profile through control panel Reload outlook.
- Test connect to Mail server system is good
But still have problems.
 
If use Mail app on Windows 10; Thunderbird then I don't any problem.
Please help me.
Many thanks & best regard.

  • SalmanAhmed's avatar
    SalmanAhmed
    Steel Contributor

    Hi Tran_Hoa_Binh

    As I can see from the screenshot which you've shared, it seems that:

    • It might be an IMAP server configuration issue
    • Try to reset your password
    • Switch the IMAP configuration to SSL (From port 143 to 993) if it's not secure.
    • Check your Windows Firewall, modify inbound rules, and add the port to "Allow the connection"
    • Contact your service provider, if they did any changes on the mail server, they need to provide a new configuration.
    • Tran_Hoa_Binh's avatar
      Tran_Hoa_Binh
      Copper Contributor
      Dear SalmanAhmed
      Thank for your respond
      But when use other app mail client (Mail, Thunderbird ...), I don't see similar problems!!!
      Best regards.
      • SalmanAhmed's avatar
        SalmanAhmed
        Steel Contributor

        You're most welcome. It seems that there is no issue with your password, firewall, and service provider's side. However, it might be a server configuration issue or caused by the port specification, and outlook is unable to detect it. It will be more transparent if you share a screenshot of the server configuration with the default port.

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