Solved

exchange 2013 receive connector reject

Posted on 2015-01-01
3
135 Views
Last Modified: 2015-01-07
Hi.
I am getting the following warning in my exchange 2013 error logs:

Receive connector Internet Connector HFC-EKHAT rejected an incoming
connection from IP address 1xx.2xx.1xx.1xx.
The maximum number of connections per source (20)
for this connector has been reached by this source IP address.


This appears constantly in the logs.  This is incoming from a country that we don't usually send or receive mails from often.

Is this normal or could this point to something more sinister?

Thanks.
0
Comment
Question by:fijiboy
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 31

Expert Comment

by:Gareth Gudger
ID: 40527028
Sounds like someone is trying to perform some sort of denial of service attack. It sounds like Exchange is your first hop. Do you have any kind of message hygiene software, appliance or cloud service in front of your Exchange server? If not, I'd recommend it.
0
 

Author Comment

by:fijiboy
ID: 40527123
Thanks Gareth. We currently do not have a service in front of our email server apart from our corporate firewall. Am looking at some security for email security etc. Is there something I can do hardware the server in the meanwhile? They seem to be connecting on port 25.
0
 
LVL 31

Accepted Solution

by:
Gareth Gudger earned 500 total points
ID: 40527249
A temporary solution may be to block that IP at your firewall. But they will often change IPs so this is a temporary solution at best.

If you have the Edge Transport role in your environment you could also do an IP Block List Provider - might help.
0

Featured Post

Guide to Performance: Optimization & Monitoring

Nowadays, monitoring is a mixture of tools, systems, and codes—making it a very complex process. And with this complexity, comes variables for failure. Get DZone’s new Guide to Performance to learn how to proactively find these variables and solve them before a disruption occurs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Scam emails are a huge burden for many businesses. Spotting one is not always easy. Follow our tips to identify if an email you receive is a scam.
MS Outlook is a world-class email client application that is mainly used for e-communication globally.  In this article, we will discuss the basic idea about MS Outlook, its advanced features, and types of MS Outlook File formats.
In this video we show how to create a Contact in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Recipients >> Contact ta…
In this video we show how to create an Address List in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Organization >> Ad…

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question