Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Outlook POP3 cant connect to exchange 2007

Outlook POP3 cant connect to exchange 2007

Outlook POP3 cant connect to exchange 2007

I have an exchange server 2007 thats been working for years. All of a sudden ALL users are getting an error message in outlook that:

"log onto incoming mail server (POP3): Your server does not support the connection encryption type you have specified. Try changing the encryption method. Contact your mail server administrator or internet service provider (ISP) for additional assistance".

Outlook is configured for SSL and port 995 on the "incoming server POP3"

I have made no changes to the server or client configurations (except maybe windows updates). Its happening to all clients so I assume this is a server issue. I disabled anti-virus on the mail server and client for testing and I verified that server configuration->client access->"MAILSVR"->POP3 properties the binding tab has the following settings:

TLS or Unencrypted Connections
Specify the local IP address and ports that you want to use for either TLS connection or unencrypted connection
(all available IPv4 address) 110

secure socket layer (SSL) Connections
Specify the local IP address and ports that you want to use for a SSL connection
(all available IPv4 address) 995

No changes to the firewall (verified port 995 is open to mail server). OWA works fine so I know its not username/password issue.

I believe this happened once before (Jan 2018) and I fixed it but I don't remember what I did (it was a google search) and I don't seem to be finding a solution this time.
My OUTLOOK error logging has (mail server URL replaced with XXXXX):

2019.06.23 01:35:36 POP3 (mail.XXXXXXXX.com): Port: 995, Secure: SSL, SPA: no
2019.06.23 01:35:36 POP3 (mail.XXXXXXXX.com): Finding host
2019.06.23 01:35:36 POP3 (mail.XXXXXXXX.com): Securing connection
2019.06.23 01:35:36 POP3 (mail.XXXXXXXX.com): Disconnected from host

RE: Outlook POP3 cant connect to exchange 2007

Is you Cert expired? I think it should give you a cert expired error instead but worth checking.
When is the last WU that installed?

Learning - A never ending quest for knowledge usually attained by being thrown in a situation and told to fix it NOW.

RE: Outlook POP3 cant connect to exchange 2007

Roll back your last update on exchange server 2007

Adrian G,
Hosted QuickBooks Expert

RE: Outlook POP3 cant connect to exchange 2007

Exchange 2007 is End of Life in 2017 - no support or patches for over 2 years ( unless you have contract extension ).

Possibly a TLS version mismatch?
Like the server only supports TLS v1.0 but the client only supports / is requesting TSL v1.2?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close