With the GDPR deadline set for May 25, 2018, many organizations are ill-prepared due to uncertainty about the criteria for compliance. According to a recent WatchGuard survey, a staggering 37% of respondents don't even know if their organization needs to comply with GDPR. Do you?
Solved
No port 25 flow. Port not open.
Posted on 2012-12-31
HI,
I have a functional exchange 2003 server - all works fine but I need to make a change to have the mail.mycompany.com resolve to another ip address - on another router - which is a draytek 2820. This is on a separate phone line.
Before I change the ip address that the mail server url points to, I wanted to verify the flow of port 25 traffic through the router - so that when the change takes place, it should be a fairly seamless cut over -and the mail flows to another ipaddress/router and then to the mail server.
So I have duplicated the port settings on the 2820 and tried to telnet to the external ip on 25 - but no connection -it wont let me. Even with both port forwarding and open port set (just to see what happens) its still bounces back. Port scans show the port is not open. Management interface shows ports defined as default but none mention 25. The ISP is the same as the other line that works ok - doesnt hesitate on telnet to 25. Cant think right now what I'm doing wrong - probably something so obvious I cant see it.. any pointers? Thanks
I have a functional exchange 2003 server - all works fine but I need to make a change to have the mail.mycompany.com resolve to another ip address - on another router - which is a draytek 2820. This is on a separate phone line.
Before I change the ip address that the mail server url points to, I wanted to verify the flow of port 25 traffic through the router - so that when the change takes place, it should be a fairly seamless cut over -and the mail flows to another ipaddress/router and then to the mail server.
So I have duplicated the port settings on the 2820 and tried to telnet to the external ip on 25 - but no connection -it wont let me. Even with both port forwarding and open port set (just to see what happens) its still bounces back. Port scans show the port is not open. Management interface shows ports defined as default but none mention 25. The ISP is the same as the other line that works ok - doesnt hesitate on telnet to 25. Cant think right now what I'm doing wrong - probably something so obvious I cant see it.. any pointers? Thanks
[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
-
4
3
8 Comments
Active today
Can't help with the routing issue but thought it may help to suggest you put both ip's in your external Dns with mx records with different priorities
That way if the connection fails to your new ip (assuming it is set to the lower priority) for any reason
Mail continuity will be preserved to the old ip whilst you resolve the problem
That way if the connection fails to your new ip (assuming it is set to the lower priority) for any reason
Mail continuity will be preserved to the old ip whilst you resolve the problem
Frist check if in local lan you can telnet it in port 25, if yes you ca pass to the routing.
Some ISP's block's port 25 to avoid spam storms, so if you have a dynamic ip address you may have be blocked. Buy some public IP address or talk with your IPS help-desk.
The other possibility is 2003 firewall or exchange connecting policy.
Also check's the gateway to internet if is correct.
Some ISP's block's port 25 to avoid spam storms, so if you have a dynamic ip address you may have be blocked. Buy some public IP address or talk with your IPS help-desk.
The other possibility is 2003 firewall or exchange connecting policy.
Also check's the gateway to internet if is correct.
Hi, I have 5 static IP addresses from the ISP. Its the same ISP that is allowing port 25 traffic on our other line.
Cannot telnet on port 25 to the router from local LAN.
thanks
Cannot telnet on port 25 to the router from local LAN.
thanks
Active today
does the mailserver connect directly to the existing router or via a network switch
How many NIc's does it have and are they on internal or external assigned ip's?
How many NIc's does it have and are they on internal or external assigned ip's?
To go back to the original reason for this change - I wanted to apply an ssl cert to OWA 2003. But, we have a .net web service website in IIS that is crucial to our business that uses port ssl cert on 443. I thought that we could use 443 again for owa as long as it was on another static internal IP address. and not "all unassigned". But when we tried to apply the ssl cert, we could not. The https://mail.mycompany.com/exchange was getting certificate errors and there seemed to be some confusion/clash with the existing certificate on 443.
We could do it with a random port number like 8018 or something but that means all users need to remember this port number and manually type it in (as far as I am aware) - I had just wanted the url to be https://mail.mycomany.com/exchange
The advice given at the time was to use a different external static ip . Hence testing smtp flow before making any changes. However, I have since thought of an additional issue that will could complicate further and it might be better to see if I can resolve the original issue first. So - 443 - any advice? Maybe should post separately.. Thanks
We could do it with a random port number like 8018 or something but that means all users need to remember this port number and manually type it in (as far as I am aware) - I had just wanted the url to be https://mail.mycomany.com/exchange
The advice given at the time was to use a different external static ip . Hence testing smtp flow before making any changes. However, I have since thought of an additional issue that will could complicate further and it might be better to see if I can resolve the original issue first. So - 443 - any advice? Maybe should post separately.. Thanks
Active today
I would do a seperate post for this
its an IIS cert issue rather than tcp/ip routing
Hope you get it sorted
its an IIS cert issue rather than tcp/ip routing
Hope you get it sorted
Featured Post
This e-book gives you an insight into the ransomware threat and reviews the fundamentals of top-notch ransomware preparedness and recovery. To help you protect yourself and your organization. The initial infection may be inevitable, so the best protection is to be fully prepared.
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
This process describes the steps required to Import and Export data from and to .pst files using Exchange 2010. We can use these steps to export data from a user to a .pst file, import data back to the same or a different user, or even import data t…
As cyber crime continues to grow in both numbers and sophistication, a troubling trend of optimization has emerged over the last year.
To show how to create a transport rule 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 Mail Flow >> Rules tab.: To cr…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…
Suggested Courses
Course of the Month14 days, 8 hours left to enroll
649 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.