certificate issue - outlook error code 20 RRS feed

  • Question

  • Hello

    something strange today in my network.. my users are getting this error when open outllook:

    impossible connect to proxy server (error code 20)

    do I need to regenerate my certificate on exchange 2003? Ho ca i do it?


    Monday, March 25, 2013 9:14 AM


All replies

  • Try putting this required URL in bypass list in IE.

    Thanks Prem P Rana MCSA Messaging 2003 MCSE 2003 Server MCTS MCITP Exchange 2007, 2010 Gurgaon, India

    Monday, March 25, 2013 11:50 AM
  • Hi  ,

    Does the certificate includes SAN(Subject Alternative Name) for autodiscover and exchange external url ?

    Please also check if the root certificate is imported to client if you use a private CA issues the certificate.

    Outlook gives an error for Proxy Server Certificate:

    Wendy Liu
    TechNet Community Support

    Tuesday, March 26, 2013 9:28 AM
  • There has been similar questions before this:

    Outlook gives an error for Proxy Server Certificate

    Here is a guide on how to request a new certificate:

    Generating a Certificate Signing Request (CSR)


    Tuesday, March 26, 2013 10:22 AM
  • Hi ,

    • Please perform connectivity test

    • The please go through the below KB article for certificate issues

    • For creating a self signed certificate using SelfSSL utility from Microsoft please go through below article

    • To download SelfSSL utility download iis6 resource kit from below Microsoft link

    Regards, Prakash Nimmala Skype : Prakash.Nimmala Email ID : Whenever you see a helpful reply, click on Vote As Helpful & click on Mark As Answer if a post answers your question.

    Tuesday, March 26, 2013 5:47 PM