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How to Test IMAPS Port 993 Connectivity From A Linux Command Line

Data pubblicazione: Jul 18, 2025
Fasi

CONTENTS

Here is how to test IMAPS port 993 connectivity from a linux command line.

STEPS TO FOLLOW

1) Run the netcat TCP connectivity test first: Network connectivity testing

2) If that is successful, run the following command to confirm SSL traffic to port 993 is not blocked:
  
openssl s_client -connect outlook.office365.com:993 -crlf -quiet

Change the FQDN from outlook.office365.com to your IMAPS server.

3) The output for a good connection looks like this:
  
openssl s_client -connect outlook.office365.com:993 -crlf -quiet

depth=2 C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Global Root CA
verify return:1
depth=1 C = US, O = DigiCert Inc, CN = DigiCert Cloud Services CA-1
verify return:1
depth=0 C = US, ST = Washington, L = Redmond, O = Microsoft Corporation, CN = outlook.com
verify return:1
* OK The Microsoft Exchange IMAP4 service is ready. [QgBOADYAUABSADEAMQBDAEEAMAAwADEANAAuAG4AYQBtAHAAcgBkADEAMQAuAHAAcgBvAGQALgBvAHUAdABsAG8AbwBrAC4AYwBvAG0A]

 
Numero articolo Knowledge

001116856

 
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