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Router Log - LAN access from remote

Posted on 2009-04-04
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Last Modified: 2012-08-13
My Router log gives me the following informaion:

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[LAN access from remote] from 198.175.112.105:41587 to XXX.XXX.XXX:25, Friday, April 03,2009 23:56:08 [LAN access from remote] from 83.240.154.46:19641 to XXX.XXX.XXX:25, Friday, April 03,2009 23:50:05 [LAN access from remote] from 92.80.195.77:1858 to XXX.XXX.XXX:25, Friday, April 03,2009 23:38:54 [LAN access from remote] from 201.236.173.91:13502 to XXX.XXX.XXX:25,
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XXX.XXX.XXX is the IP of my SBS2003.

I do not recognize the remote IPs. Should I be worried? Does this mean remote access was attempted or succeeded?

If so, what can I do to stop it?
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Question by:hgj1357
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by:blissbear
blissbear earned 300 total points
ID: 24068772
Port 25 is used to run SMTP servers. There are many email spammers out on the internet which regularly scan for open SMTP ports with misconfigured SMTP servers through which they can relay their spam email through.

If you have your SBS2003 box set up to receive email messages for a subnet or dns entry this activity is normal behavior.

If you don't receive email through your SBS2003 box, you can stop this activity by either setting up a firewall filter at your router or through disabling your SMTP server on your SBS2003 box.

If you are using a NAT router for your LAN, it's also likely that the SBS2003 is setting up a uPNP port forward for port 25 to itself.
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by:hgj1357
ID: 24068779
SBS is running exchange and accepts email. You're right, port 25.

I'm I correct in thinking that if the SBS is set up correctly I should be ok?
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by:blissbear
blissbear earned 300 total points
ID: 24068826
If your SBS is set up correctly and you have the most recent updates from Microsoft, then you should be fine in my opinion. :)
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by:ampranti
ID: 24072083
Check your mail server if is an open relay. Apply latest patches.
Use a more sophisticated firewall (doing smtp inspection) and you are fine
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by:Maeros
ID: 24080320
A surefire way to check to see if your SMTP is restricted properly would be to run a quick SMTP test externally.

Try going to the following link and enter your mail server's address.  If your SMTP has been set up correctly, all parts of the test should pass.  The results shouldn't be too difficult to interpret, however to be sure please post the test results.
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Maeros earned 200 total points
ID: 24080328
Well I suppose it would help if I actually posted the link.  My goof ;)

http://www.mxtoolbox.com/diagnostic.aspx
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by:hgj1357
ID: 31566627
I was concerned with the router logs than the mail server but the responses were useful
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