cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements
Cisco Secure Email Support Community

Product Support Talos Support Cisco Support Reference + Current Release
Gateway Reputation Lookup Open a support case Secure Email Guided Setup
Gateway: 14.2.0-616
Cloud Gateway Email Status Portal Support & Downloads docs.ces.cisco.com
Email and Web Manager: 14.2.0-203
Email and Web Manager Web & Email Reputation Worldwide Contacts Product Naming Quick Reference
Reporting Plug-in: 1.1.0.136
Encryption Bug Search
Encryption Plug-in: 1.2.1.167
Cloud Mailbox Notification Service
Outlook Add-in(s): More info

2175
Views
5
Helpful
1
Replies
hatsa
Beginner

Ironport Email 4.4.2 Bad Connection Lost

Hello,

I have a problem with my Ironport C170. It happens only on some Email with attachment from Ironport to Exchange Server. Most of Emails (with attachment or not) have no problem with it.

I have check the connection from Ironport to Exchange server and there's no issue.

 

2020-01-23_13h32_02.png2020-01-23_13h46_48.png

1 REPLY 1
marc.luescherFRE
Enthusiast

I can only speculate but in other cases this could happen when trying to sent a larger file attachment on a line which is bandwidth constraint.

 

To debug further go to Administration->Log subscription and create a new log of type "Domain Debug Log".  Specify the domain you are having problems with, and make the number of SMTP sessions at least 20. Once you are running in the problem again, download that log and check the content for the following events :

 

If the log only shows the message headers, and stops at the "data" section, then an MTU problem is the cause, so they might need to fix their firewall to allow ICMP path discovery trough. If you see data transmitted after the header part, then the bandwith is simply too slow.

 

I hope that helps.

 

-Marc

 

Create
Recognize Your Peers
Content for Community-Ad