My folks' office is connected to the net using DSL and the PCs in there are connected using both LAN/Wi-fi (total of 1 LAN Client and 2 Wi-fi Clients all on Windows XP SP3). They were running on a Belkin Wireless G Router (F5D7230-4). While the connection was not always stable, everything (internet, web applications) worked when it is connected. A few months later, they got a little fed up with the constant connection drops from the Wi-fi signal and had to reset the modem/router a couple of times each day and switched to a D-Link Wireless N (DIR-625 RevC).
Now, the Wi-fi stability problem is solved and they didn't have to to reset 5 times each day and the users have more stable connections to the internet. However, one of the web applications they use now have a problem. When they attempt to log into the web application using IE7, it gave them a http 501 or 503 message. This happened on all clients, the LAN and both Wireless clients.
The DSL service has not changed and the web application was functioning correctly while under that old, albeit Wi-Fi unstable Belkin. So calling the web app's tech support and they claim everything is working fine on their end. Asked me to uncheck the use http 1.1 in advanced setting, nothing. Uncheck show http friendly messages to attempt to run an diagonostics couldn't produce any noticeable results. So finally, the tech asked me to try Firefox 3 with Adobe Reader 9 installed. I went and did that on the LAN Client, and strangely enough, Firefox 3 with Adobe 9 worked just fine.
A few weeks later, I finally had the chance to see if I can follow this up on the Wireless clients. As the users say as long as they can get on the web app it is fine, they don't care which browser they would use. So I installed Firefox 3 and Adobe 9 on one of the Wireless clients, cannot connect and seem to be acting like what IE7 is doing.
Could there be a setting in the D-Link Router that may be causing this? As far as I know, no related settings were changed on any of the clients and no DSL service type was altered prior to the router switch. Logic would have me beliving that it may have been caused by the D-Link router. I e-mailed their support, got one response telling me to do things I already did to set up the router in the first place and nothing else.
So right now, the current status at the office is:
LAN Client -
IE7/Adobe 9 - Http 501/503
FF3/Adobe 9 - No connecion problem
Wireless Client -
IE7/Adobe 9 - Http 501/503
FF3/Adobe 9 - Http 501/503 (may not be the same types of messages, but it just won't connect correctly like the LAN client using FF3)
Any suggestions? Is it the Router? Something with IE7? Strangely enough, we use the same router with the exception being the one at home is a RevA and we use Cable Modem as ISP. But we had no problem connecting to the web application correctly with IE7 using LAN or Wi-Fi. Both Routers (home or office) were set up using same basic paremeters with WPA2 security (it'll take both WPA/WPA2) and no other advanced settings were really messed with.
Thank you for your time.