RE: SMTP could not connect to the DNS server '192.168.1.254'. The protocol used was 'UDP'. It may be down or inaccessible.
- From: "Darryl Janetzki" <darrylj@xxxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 11 Aug 2004 01:04:09 +1000
I resolved the problems
ISA 2004 has to have protocol rules enabled for the internal interfaces
of ISA and the Exchange server
Follow the article "Configuring an Inbound and Outbound SMTP Relay" Then
Create an additional rule Exch > ISA SMTP
Allow SMTP From Exch > SMTP RELAY and Local host
After the rule is enabled test the connectivity ( TELNET "HOST" 25 )
to the Exchange server and the SMTP relay to verify
The same concept is required connectivity to the ISA Firewall
installation client, RDP and DNS
I also had problems with installing the AV software on the ISA server...
Creating the appropriate rules to enable connectivity between the
appropriate servers resolved this issue...
Now that raises another issue The internal/external Web server was also
failing l .... What is the recommended practice for protocol rules
between Infrastructure servers, clients and ISA2004 I see these issues
as quite an important concept in securing ISA 2004 and enabling
appropriate access as most admins will probably create a rule
(FROM) (TO)
Server Name All Protocols ISA Local
Internal ISA Internal
Darryl Janetzki
________________________________
From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx]
Sent: Tuesday, 10 August 2004 1:24 PM
Subject: RE: SMTP could not connect to the DNS server '192.168.1.254'.
The protocol used was 'UDP'. It may be down or inaccessible.
Hi Darryl,
You'll have to create access rules on the ISA firewall to access the
protocols and sites you require.
Also, make sure the system policy matches your organization's
requirements.
HTH,
Tom
www.isaserver.org/shinder <http://www.isaserver.org/shinder>
Get the book!
Tom and Deb Shinder's Configuring ISA Server 2004
http://tinyurl.com/3xqb7 <http://tinyurl.com/3xqb7>
MVP -- ISA Firewalls
-----Original Message-----
From: Darryl Janetzki [mailto:darrylj@xxxxxxxxxxxxxxxx]
Sent: Monday, August 09, 2004 10:12 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] SMTP could not connect to the DNS server
'192.168.1.254'. The protocol used was 'UDP'. It may be down or
inaccessible.
http://www.ISAserver.org
Hi, I have an Exchange 2003 server behind an ISA 2004 server
Outbound mail is not working. I have not deployed a SMTP relay at this
point...
I can resolve external DNS sites from the DNS forwarder on
ISA..... Any suggestions?
Also, ISA 2000 allowed internal servers be accessed by RDP and
the Internal web servers via the DNS names... that functionality has
stopped. I am only able to access internal web servers via NetBIOS
names. External publishing of web and RDP works just fine
Thanks
Darryl Janetzki
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