java.lang.Runtime Exception: Empty writer returned: 530-5.5.1 Authentication Required

[jpvniekerk]

My program sends SMTP emails via my own gmail account. Numerous users have no problems, but one user gets the error "java.lang.Runtime Exception: Empty writer returned: 530-5.5.1 Authentication Required" when an email is sent.

What causes this and how can it be corrected?

Thanks for any help.

 

[Erel]

Are you setting UseSSL to true?

 

[jpvniekerk]

Are you setting UseSSL to true?

Yes, Here is my first piece of code relating to emailing:

If FirstTime Then
   ...
   ...
   ...
   ...
   ...
   SMTP1.Initialize("smtp.gmail.com", 465, "[email protected]", "******", "SMTP")
   SMTP1.UseSSL = True
      
End If

... are other commands that has nothing to do with email.

 

[Erel]

Your code looks correct.

Do you have access to this device? Does it happen when the device is connected to a specific network?

 

[jpvniekerk]

No, I don't have access to the device. Apparently it happens on this device "all the time". Not sure if it is always on the same network.

 

[Erel]

Mobile network providers might add their own firewalls that may cause such problems.

 

[jpvniekerk]

Any idea of how to overcome this problem? - without having to resort to trying the carrier to change their firewall! The issue is in Namibia - pretty difficult to discuss technical issues with them!

 

[Erel]

Maybe you can try to "fail" to a non-SSL SMTP (other than Gmail).

 

[Dman]

I had this same issue and did a google search and wound up here. In case anyone else has had this issue, what fixed it for me was entering the CORRECT password for the gmail account. I had a typo in my code on my test app and was using the gmail address for the address AND the password.

Just thought I would pass it along.

 

[RFman]

I had this same issue and did a google search and wound up here. In case anyone else has had this issue, what fixed it for me was entering the CORRECT password for the gmail account. I had a typo in my code on my test app and was using the gmail address for the address AND the password.

Just thought I would pass it along.

Ater getting this error, got a gmail indicating that if I want my app to have access to sent gmail to change my security settings at the link provided. I did so, and the gmail now works with my app.