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RE: web pages not loading (from certain networks) but not a routing i ssue.
This reeks of an MTU problem somewhere. Did you happen to have ICMP filtered to/from your sites recently? Remember, ICMP isn't just that protocol that lets you ping stuff. You may have broken path MTU discovery. Jason Young CNS - Network Design, Anheuser-Busch (314)577-4597 > -----Original Message----- > From: Nanog [mailto:Nanog@exchange.ware.net] > Sent: Friday, September 07, 2001 9:52 AM > To: email@example.com > Subject: web pages not loading (from certain networks) but > not a routing > i ssue. > > > > Ok guys, > > Interesting problem that seems to have started on Friday. > > Here's the deal, it seems that certain (not all) web pages on > various sites > we host are not loading for certain customers. It started on > Friday with > visitors on Verizon DSL waiting forever for pages to load. > > Yesterday and today PacBell DSL and some Netcom customers started > complaining. > > This only seems to occur on HTTP traffic. If we have the > visitors try HTTPS > the pages load fine (with the normal encryption slowdown). > > We've looked at Layers 1-4, and can't see any problems, ping > looks great, > interfaces and cpus on routers, servers and switches look fine. > > It's almost like it's a transparent cache "bug". Anyone know > if Inktomi, or > any major cache vendors rolled out any new code this week? > > For that matter does anyone know what caches Verizon and SBC use for > starters? > > Other variables: it only seems to occur on IIS based systems > (I know I know, > no flame wars or suggestions for replacements). Although it's > not happening > on all of our IIS servers. > > Any clues are greatly appreciated. > > Steve > >