Page cannot be displayed until refresh (F5)

hi there,

certain users receive a "Page cannot be displayed" when first launching IE6 SP2 via terminal services. This is for any external site, regardless of content. Hitting refresh (F5) or the GO button corrects the issue and the page loads immediately.

Relevant Info:
- Users access IE via terminal servers forwarding requests to ISA 2006.
- Internal pages load perfectly, first time.
- If the users sets homepage to an internal page, then from there navigates to any external page, it works fine.
- If the user sets homepage to "about:blank", the error occurs for the first external page they attempt to access, then with refreshing it works fine.
- Issue is independant of Group Policy, or permission levels. Have moved users to OU with no group policy; have added user to domain admin group etc - no change, first attempt (external only) is always "page cannot be displayed", then fine with refresh.
- Have cleared the users temp IE files etc - no change
- Version is IE6 SP2 6.0.3790.3959 on W2K3 R2 SP2 Terminal Server
- There are no errors in the ISA event log

I don't think issue is DNS related for two reasons:
1) nslookup from the users session works fine and fast - everytime.
2) when the user launches IE, the status bar reads "Connecting to site <correct ip>" and then fails.

Another interesting fact is that while monitoring connections on ISA, when the user launches IE and waits for the homepage to load (which fails), nothing registers with ISA. When the user hits refresh or the GO button, the page then loads and connections can be seen in the ISA monitoring screen. It's as though the connection does not reach ISA the first time a user attempts to visit an external site.

Open to suggestions.
Charlie8Asked:
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ee_autoConnect With a Mentor Commented:
Question PAQ'd, 500 points refunded, and stored in the solution database.
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madzantaCommented:
Do they have the windows firewall on? If, try turning it off.
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microITCommented:
We have the same issue, do you use a proxy?  We use bluecoat, I'm wondering if that is related in your instance?
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microITCommented:
sorry, I see you are using ISA now.
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microITCommented:
Do you mind telling us if you found a solution?  We have this issue and have went down the following paths and no luck:
1. Proxy evaluation
2. DNS evaluation
3. Browser evaluation

If you have any ideas on what caused your issue it very well may help the rest of us.  I would really appreciate it if you could share your thoughts..
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Charlie8Author Commented:
Well, we use GPO to force proxy settings for users. The GPO forces and also prevents users from changing/removing proxy server settings this. We removed that and did the following:

1. Open IE
2. Tools > Internet Options > Connections > LAN Settings > Advanced
3. Untick "Use the same proxy server for all protocols"
4. Manually fill in any remaining blank entries
5. Close and restart IE

Don't ask me why, but this works.
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microITCommented:
thanks, we use transparency so there are no proxy settings to mess with so apparently that will not apply to us.  our issue did go away however, we are not positive which of the many things we did actually fixed the issue.
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