smtp - Cannot connect to server from development machine. Works fine on prod.

Discussion in 'Email' started by Mitchell N, May 25, 2020.

  1. I am using and .NET Core, Syetem.Net.Mail.
    The code works fine when running on the winhost server (i.e. the production web site) but when running on my local (development) machine it errors out when trying to connect to the smtp server. The error message is "A connection attempt failed because the connected party did not properly respond after a period or time, or established connection failed because connected host has failed to respond."
    Since all works fine on the live web site I would guess the issue is not in the code.
    My workstation is on a domain from work. When I test and get this error I am not at work though. I have a VPN installed which I use when I telecommute but it is not turned on when I test this site and get the described error. I hear that it may be some network issue, firewall, VPN, ISP, etc. but not having enough knowledge in that area I don't know what to check/test. Does anybody have some specific, clear advice?
  2. Elshadriel

    Elshadriel Winhost Staff

    Check to see if port 25/587 is blocked by your firewall. Those are the SMTP send ports. That's most likely what the problem is.

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