OWA internal and external address is trying to resolve on an external DNS server on the internet

  • Thread starter FrancoisKaljeeSA
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FrancoisKaljeeSA



Hi Everybody,

As from yesterday my internal and external OWA address is trying to resolve on an external DNS server on the internet. We have an Exchange 2007 environment which connects through an ISA 2006 box.

This is the ping for our internal OWA address:

C:\Documents and Settings\momservices>ping https://hfc16.hernic.local/owa

Pinging https://hfc16.hernic.local/owa [67.215.65.132] with 32 bytes of data:

Reply from 67.215.65.132: bytes=32 time=629ms TTL=51

Reply from 67.215.65.132: bytes=32 time=680ms TTL=51

Reply from 67.215.65.132: bytes=32 time=697ms TTL=51

Reply from 67.215.65.132: bytes=32 time=670ms TTL=51

This is what is it supposed to return:

C:\Users\fkaljee>ping hfc16.hernic.local
Pinging hfc16.hernic.local [10.25.0.16] with 32 bytes of data:
Reply from 10.25.0.16: bytes=32 time<1ms TTL=128
Reply from 10.25.0.16: bytes=32 time<1ms TTL=128
Reply from 10.25.0.16: bytes=32 time<1ms TTL=128
Reply from 10.25.0.16: bytes=32 time<1ms TTL=128

This is the ping for the external address:

C:\Documents and Settings\momservices>ping https://mail.hernic.co.za/owa

Pinging https://mail.hernic.co.za/owa [67.215.65.132] with 32 bytes of data:

Reply from 67.215.65.132: bytes=32 time=435ms TTL=51

Reply from 67.215.65.132: bytes=32 time=532ms TTL=51

Reply from 67.215.65.132: bytes=32 time=372ms TTL=51

Reply from 67.215.65.132: bytes=32 time=445ms TTL=51

This is what it is supposed to return:

C:\Users\fkaljee>ping mail.hernic.co.za
Pinging mail.hernic.co.za [196.212.18.142] with 32 bytes of data:
Reply from 196.212.18.142: bytes=32 time<1ms TTL=128
Reply from 196.212.18.142: bytes=32 time<1ms TTL=128
Reply from 196.212.18.142: bytes=32 time<1ms TTL=128
Reply from 196.212.18.142: bytes=32 time<1ms TTL=128

Can anyone help in this regard, we haven't changed anything on our DNS, ISA rules or Exchange environment. We contacted our ISP and they also haven't made any changes.

Kind Regards,

Francois Kaljee
Regards Francois Kaljee IT Systems Administrator Direct: 012 381 1000 Cell: 082 852 2367 Fax: 086 602 8482 GPS: S 25 39.639 E 27 50.699 Hernic's Street Address: R/E of PTN 103 De Kroon 444 JQ Brits 0250 South Africa Hernic's Postal Address: P.O.Box 4534 Brits 0250 South Africa
 
S

Sembee [MVP]



The IP address you are getting replies from is OpenDNS.
Therefore somewhere OpenDNS is getting involved.

Check the IP config of the clients to ensure that only internal DNS is set, no external DNS. The same goes for any servers.

It has to be something local.

Simon.

Simon Butler, Exchange MVP
Blog | Exchange Resources
 
F

FrancoisKaljeeSA



Hi Simon,

Thanks for the reply, but we discovered that we were victims of a DNS Pollution Attack. As soon as I flushed the Cache on my ISA and Web Marshal the problem was cleared. The DNS query was being re-routed from the ISA firewall.

Thanks

Francois Kaljee

Regards Francois Kaljee IT Systems Administrator Direct: 012 381 1000 Cell: 082 852 2367 Fax: 086 602 8482 GPS: S 25 39.639 E 27 50.699 Hernic's Street Address: R/E of PTN 103 De Kroon 444 JQ Brits 0250 South Africa Hernic's Postal Address: P.O.Box 4534 Brits 0250 South Africa
 
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