Question

URGENT HELP: New static IP address now cant remote access servers.

Asked by: SWESupport

AHHH. right here we go, the company upgraded the internet plan and obtained a new static ip address, upon changing the settings in the modem with the new user and pass, no one from the remote sites or anyone out side of the domain can access the servers, whats gone wrong?? need help.

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Asked On
2009-11-05 at 16:41:08ID24876692
Tags

static ip

,

server

,

windows server 2003

Topics

Windows 2003 Server

,

Virtual Private Networking (VPN)

,

Domain Name Service (DNS)

Participating Experts
3
Points
500
Comments
31

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Answers

 

by: Raheem05Posted on 2009-11-05 at 16:45:23ID: 25755762

How are they accessing the servers? If you have been given a new static IP

You need to change MX, A records with the new IP if you use VPN tunnels you need to recreate the setup file to reflect the new ip

 

by: OvePosted on 2009-11-05 at 16:46:48ID: 25755771

firewall-rules correct with the NEW Ip?
would be great if you can give some more information on your setup.

Ove

 

by: Raheem05Posted on 2009-11-05 at 16:46:59ID: 25755772

When you say remote sites are there firewalls between the 2? if so the rules on the firewall are more then likely natted with the old IP you need to look at the firewall rules and change every entry with the old ip to the new ip

 

by: wolfcamelPosted on 2009-11-05 at 16:55:49ID: 25755807

by the sounds of it - you need to change the dns records.

remote users are probably connecting to mail,yourcompany.com.au or something similar - and this currently points to the old ip.

If you need physical help I am in Perth with time on my hands

 

by: SWESupportPosted on 2009-11-05 at 16:58:12ID: 25755822

I believe it is something to do with DNS records as I just got a call from someone that sent an email to me and it bounced back. So how do i change this?
Also the VPN tunnel will need to be altered, if someone can tell where i can look for the setting i will post em up.
Using Windows Server 2003.

 

by: SWESupportPosted on 2009-11-05 at 16:59:10ID: 25755827

Also there are two servers, one for exchange and storage the other is for terminal sessions.

 

by: Raheem05Posted on 2009-11-05 at 17:00:12ID: 25755833

OK who hosts your domain name? do a whois lookup you need to go to the person who managed your domains and tell them of the new IP change and get them to make the changes you then need to look on your firewall and change all records pointing to old ip to reflect the new ip

Which VPN tunnel do you use?

 

by: Raheem05Posted on 2009-11-05 at 17:01:11ID: 25755838

Your MX records - Mail Exchange records, A records for all domains you have i.e. outlook web access etx all these need changing to reflect the new IP you need to liaise with the whoever manages your domain or tell us the name of the domain and we will try to dig out

 

by: wolfcamelPosted on 2009-11-05 at 17:03:10ID: 25755846

once you change the dns, you will need to wait a little while for it to update to all people trying to contact you - so dont expect it to work straight away.

Once your dns is fixed your vpn may also work - depends if it is contacting by IP or by name.

 

by: Raheem05Posted on 2009-11-05 at 17:03:35ID: 25755849

Do a MX lookup on your domain name for emails i.e @companymail.com

http://www.mxtoolbox.com/

You will see that it points to the old ip

Do the same for all other websites like owa etc and again they will point to the old ip, DNS and MX changes are not instant so you gotta start moving on this so the impact is not as big as your going to start loosing emails

 

by: SWESupportPosted on 2009-11-05 at 17:13:34ID: 25755905

Yep pointing to old IP, so is it as simple as ringing the ISP and telling them the  static IP has changed?

 

by: Raheem05Posted on 2009-11-05 at 17:14:26ID: 25755912

yes give them the new ip tell them you want to change domain company.com mx records to reflect the new ip and then any other websites and your done it will take a while to replicate and come inforce

 

by: wolfcamelPosted on 2009-11-05 at 17:21:40ID: 25755941

assuming your ISP is responsible for your DNS - this isnt always the case, but fairly likely.
do a whois lookup as suggested above to findout who is hosting your domain.

sometimes it is hosted by the company that has developed your website.

 

by: SWESupportPosted on 2009-11-05 at 17:22:13ID: 25755947

okay, DNS records has now been changed. However the IP address they had was differant to what came up on the lookup!? ISP says 1hr for the change. So we will see how it pans out in an hour. Appreciate ur quick responses!!! will come back in an hour.

 

by: wolfcamelPosted on 2009-11-05 at 17:28:06ID: 25755979

make sure they idnt change your www address if that was hosted somewhere else.

 

by: Raheem05Posted on 2009-11-05 at 17:28:39ID: 25755982

no problem just give it sometime and check again

do a nslookup for the domain names and an mx lookup from time to time to see the changes you will be fine also please make sure your firewall rules reflect the new IP i.e. if your natting smtp connections for port 25 you need to make sure the rule on your firewall takes into effect the new public ip do the same for any other policies which show the old ip and you wont have any problems

 

by: Raheem05Posted on 2009-11-05 at 17:29:15ID: 25755985

yes as wolf says they are probably changing your www records did you specify mx record change?

 

by: Raheem05Posted on 2009-11-05 at 17:29:47ID: 25755991

the lookup address should be the one you need to change and should have the old ip static ip

 

by: SWESupportPosted on 2009-11-05 at 18:37:28ID: 25756208

ok well everyone can connect to the VPN, however remote desktop aint working.

 

by: SWESupportPosted on 2009-11-05 at 18:41:57ID: 25756230

but a weird thing happened, a user appeared under the tsadmin console and then it went to idle pretty much straight away and the users says it is telling him he cant connect.

 

by: Raheem05Posted on 2009-11-05 at 18:43:42ID: 25756235

Clear the session and try again monitor it then have a look at the event logs on the server and what do you spot?

 

by: wolfcamelPosted on 2009-11-05 at 19:20:00ID: 25756355

are the users connecting to the terminal after connecting to the vpn.
how do they connect - with a full domain name eg terminal.company.com or just the internal name eg
terminal - or the internal server Ip address?

 

by: SWESupportPosted on 2009-11-05 at 21:37:40ID: 25756819

Ok it was a firewall rule that was blocking it, wrong port was open. Not getting emails from out side the domain now though, so i gather that will be another rule, any one know what port should be open for exchange?

 

by: Raheem05Posted on 2009-11-05 at 21:45:22ID: 25756843

25 SMTP

 

by: OvePosted on 2009-11-05 at 22:42:43ID: 25757083

normally DNS-records are cached for a day or (also seen up to three days)...so due to the "time to life (ttl)" it will last that long until other mail-servers ask for your actual ip from the MX-record. So the next time email-flow should start.

Do you get onto your email-server from outside when trying :

telnet <yourNewIp> 25

from your home-computer ?
You normally should get a line starting with "220...<your mailserver>...ready"

If this works does:
telnet <yourMXDomainName> 25

also work?

Ove

 

by: SWESupportPosted on 2009-11-05 at 22:47:50ID: 25757114

still getting nothing from external emails.
I have the following rules setup in port forwarding;

- SMTP -
Protocol = TCP
Port Start + 25
Port End = 25
Port Map = 25
- DNS -
Protocol = UDP
Port Start = 53
Port End = 53
Port Map = 53

Right?

 

by: Raheem05Posted on 2009-11-05 at 22:49:30ID: 25757119

create a nat rule on your firewall for SMTP

From: Any
To: NAT Public IP - Private IP of exchange server
Port 25

 

by: SWESupportPosted on 2009-11-05 at 22:50:57ID: 25757131

Event log is showing issues with DNS - Event IDs - 5504 and 7062 seem to be quite regular.

 

by: Raheem05Posted on 2009-11-05 at 22:52:05ID: 25757137

 

by: wolfcamelPosted on 2009-11-05 at 23:13:06ID: 25757212

did you get your mx record updated also?

 

by: SWESupportPosted on 2009-11-05 at 23:57:16ID: 25757397

ok its to do with antivirus mail messenger service (trend mirco) I have to change the IP address with them as well cause at the moment the emails are sitting with them waiting to go some where. Hope fully that sorts it. Thanks everyone for your help.

20120131-EE-VQP-002

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