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Windows Thread, Exchange 2003 - no external email - urgent in Technical; have restarted both our isa servers but the issues remain... at a loss any ideas?...
  1. #16
    kevbaz's Avatar
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    have restarted both our isa servers but the issues remain... at a loss

    any ideas?

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    mrmontymick's Avatar
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    Quote Originally Posted by kevbaz View Post
    have restarted both our isa servers but the issues remain... at a loss

    any ideas?
    were you able to try plugging a machine in to the external switch?

    as a stupid question have you checked the default gateway on the exchange server?

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    Quote Originally Posted by mrmontymick View Post
    were you able to try plugging a machine in to the external switch?

    as a stupid question have you checked the default gateway on the exchange server?
    And that the Global Catalogue server is contactable from it...

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    Quote Originally Posted by mrmontymick View Post
    were you able to try plugging a machine in to the external switch?

    as a stupid question have you checked the default gateway on the exchange server?
    not able to plug in a diff machine to test..


    the default gateway is set and is pointing at one of the isa servers


    And that the Global Catalogue server is contactable from it...
    no idea how to test that...

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    Quote Originally Posted by kevbaz View Post
    not able to plug in a diff machine to test..


    the default gateway is set and is pointing at one of the isa servers




    no idea how to test that...
    The next thing I would try is either bypassing the ISA server entirely or putting a new ALLOW all INBOUND and OUTBOUND as the top rule on the ISA server.

    If you can't bypass try the new ALLOW rule. It that works your existing ruleset has an issue, if it doesn't work then it's probably a deeper problem.

    BTW did: telnet <smarthost> 25 work at all?

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    Do you know which server runs as the GC? If you do (I'd hope you do in a network enviroment!) then just check it's working.

    If you need to find out:

    Log on to Exchange Server
    Open System Manager
    Expand the tree to Administrative Groups > First Administrative Group > Servers > The name of the server your on.

    Right click on that server name, go to Directory Access and you will a list of servers. In the "type" column you'll see one or more is listed as a GC.

    For Exchange to function it needs constant access to the GC - it can survive without DC access for a while but not GC

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    kevbaz (1st July 2009)

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    telnet didnt work no...


    at the moment neither isa server seems to be able to browse the internet but our workstations can? and when i attempt to ping bbc.co.uk i get destination host unreachable?

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    Quote Originally Posted by mb2k01 View Post
    Do you know which server runs as the GC? If you do (I'd hope you do in a network enviroment!) then just check it's working.

    If you need to find out:

    Log on to Exchange Server
    Open System Manager
    Expand the tree to Administrative Groups > First Administrative Group > Servers > The name of the server your on.

    Right click on that server name, go to Directory Access and you will a list of servers. In the "type" column you'll see one or more is listed as a GC.

    For Exchange to function it needs constant access to the GC - it can survive without DC access for a while but not GC
    3 of our servers are set as GC one of which is one of the isa servers

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    mrmontymick's Avatar
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    Quote Originally Posted by kevbaz View Post
    telnet didnt work no...


    at the moment neither isa server seems to be able to browse the internet but our workstations can? and when i attempt to ping bbc.co.uk i get destination host unreachable?
    If telnet didn't work then your ISA server is most likely blocking it or it's unreachable further down the line.

    ISA servers normally can't web browse unless you have specifcally set them up to do so.

    Try doing a tracert to BBC - Homepage and see where the trace stops.

    I would still try the ALLOW all rule - just make sure that it's at the top above and deny rules and that you have applied the changes.

    If that still doesn't work the issue is probably further down the line.

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    kevbaz (1st July 2009)

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    Quote Originally Posted by kevbaz View Post
    3 of our servers are set as GC one of which is one of the isa servers
    I'd guess as your internal mail is working fine on exchange it's probably not a DC or GC connectivity issue....

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    Quote Originally Posted by mrmontymick View Post
    If telnet didn't work then your ISA server is most likely blocking it or it's unreachable further down the line.

    ISA servers normally can't web browse unless you have specifcally set them up to do so.

    Try doing a tracert to BBC - Homepage and see where the trace stops.

    I would still try the ALLOW all rule - just make sure that it's at the top above and deny rules and that you have applied the changes.

    If that still doesn't work the issue is probably further down the line.


    tracert to bbc website is destination host unreachable?


    not sure how to go about the allow all rule?

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    Quote Originally Posted by mrmontymick View Post
    I'd guess as your internal mail is working fine on exchange it's probably not a DC or GC connectivity issue....
    Is internal mail working fine? Lol i should really read more thoroughly

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    yeah internal is fine

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    its just very odd that we have internet access yet external emails in or out dont work and neither does the college website....

    cant get my head around that

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    Quote Originally Posted by kevbaz View Post
    its just very odd that we have internet access yet external emails in or out dont work and neither does the college website....

    cant get my head around that
    That's normally either a publishing error with ISA server or an ACL (access control list) error on your router or down the line with your ISP.

    External publishing of services in ISA is fairly differently setup from web browsing.

    Is your ISA server acting as a web proxy or do you pass requests through to an external web proxy or does your ISA server chain to an external web proxy?

    Have you asked your ISP if they can make a connection to your exchange server or website from their internal network? And to trace to see where it's stopping?

    If it stops at your ISA server address (technically probably just before it) then it's the ISA server that's causing the issue.

    If it stops before that it's a chaining/routing/ACL issue between you and your ISP.

    Again bypassing ISA or an overriding allow rule would probably help you diagnose this.



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