RE: Odd experience with new internet connection
- From: Rob <Rob@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 4 Sep 2005 04:51:04 -0700
Can you create a hosts file as a test? That would Weed out DNS I think. If
you ping -t one of the domains, does it drop? How about running a speed test
from a site like dslreports.com? They have several tests that might point you
in a direction.
"Grant" wrote:
> We recently decided to upgrade our ADSL link to a HSDSL link. Our ISP
> allocated a new IP range and installed the new link. We cut over Friday
> night, changed the IP on the external NIC and run the ICW. All appeared to
> be working OK. By Monday we noticed that although we could receive email we
> had trouble sending email to the majority of domains. Oddly, we could send
> to a few domains (such as Microsoft Professinal Support, our ISP and a range
> of domains). Email that would not send would sit in the Exchange queue. A
> message logged was "the connection to the remote host was dropped." Messages
> remained in the queue and no NDR was generated. After some discussions with
> our ISP, they convinced us that all was OK on their side and the problem MUST
> be with Exchange - it seems to me that this was an easy response from the ISP
> tech support guys. We contacted Microsoft Support and spent a long week
> going through a lot of different issues including reinstalling IIS and
> Exchange (and am now working through associated fixes for the IIS, eg fixing
> companyweb and remote access etc). We also checked external with the ISP on
> several occasions, doubled checked the DNS records, created reverse DNS
> entries. All this did not work, even the IIS reinstall, Exchange reinstall,
> triple checking ISA, remove virus scanning - we did just about everything!!!
> No matter what messages remained in the queue with the only clue - remote
> host dropped connection. We checked all possible block lists and checked
> access to the problem domains using Telnet. In fact I could send complete
> emails to receipients using Telnet to their mail servers from the SBS Server.
> This seems to eliminate the DNS and blocking issues. By Thursday night
> (about 9:00pm - still with the Microsoft support guy on the phone) I decided
> to cut back to the old connection (not yet disabled, thankfully). After doing
> this an running ICW all the messages were sent without an issue. So, there
> seems to be an issue with the new link. Back on the phone to the ISP support
> guys (firstly to get a DNS push done) they insisted that this could not
> possibly be the case. I needed to insist that they do the DNS push and then
> have a close look at the link, in particular the router they supply (a Cisco
> 828 - config as bridge). They remain convinced that there is nothing wrong
> with the link and the problem must be in the SBS Server or our equipment.
> Now after a long storey I will get to the question. Has anyone experienced
> something similar (the problem that is, not the service? from my ISP tech
> guys!)? From far as I can see SBS is fine (as it has always been) and the
> ISP cannot explain why everything works fine with the old link and not the
> new link. By the way, it came to my attention that as well as email not
> being sent to some (large majority of ) domains, users on my internal network
> had odd little problems accessing some web sites, for example, users could
> not log on to Hotmail, some other webmail sites would not allow an email to
> be composed, some secure sites would not work properly, and some would. All
> these issues dissapered when went back to the old link. Any ideas would be
> great.
> A final point - the Microsoft support guy was FANTASTIC. He has remained
> with the issue throughout and went beyond the cause - even working two hours
> past his finish time one evenning and is still helping fixing up the few
> problems with that remain with the IIS resintall. Full points to MPS.
> --
> Grant SBS2003
.
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