Strange Shopping Cart Problem on InvadeIT

[IMHO]

Well, that's well over my head! Are you suggesting that this is something that the web site operator needs to look at or is it something that I can do from my end?

DM

As mentioned in that article:

When ViewState in your page become very large it can be a problem as some firewalls and proxies will prevent access to pages containing such huge ViewState sizes

There are 2 possible solutions, if indeed this is this issue (and their ViewState is ridiculously large BTW)

1) Find a setting in your router/firewall that's limiting the size of post-back data (the data your web browser sends in the HTTP request), and change/disable it. Note it may not be a user setting though - it could just be a hard limit.

2) InvadeIT fix their website so it either doesn't use ViewState, or at least controls it's size.

Edit: Here's an actual example of the ViewState data InvadeIT expect your web browser to post-back when adding an item to their cart:

__EVENTARGUMENT __EVENTTARGET ctl00$ContentPlaceHolder_Main$Button_Basket __VIEWSTATE

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ctl00$FooterLinks1$NewsLe... ctl00$TextBox_Search

@InvadeIT: if you're reading this, tell your dev to use session state instead of view state, problem solved.

Edited June 19, 2014 by IMHO

[doctormann]

I think we can probably say this is a connection issue to ASP servers. (Both InvadeIt and Catalog-7 run ASP)

It may be that packet data is being dropped, possibly from oversized packets that are then truncated.

@DM, I'd like to you try two separate experiments:

Set your router MTU to 1100. reboot and test.

Set your router and PC to matching MTU: 1492 (or smaller; 1400)

Your streaming issue may related. Probably. Possibly.

I shall try this at some stage. Bit busy today - maybe later.

DM

[doctormann]

Well, that's well over my head! Are you suggesting that this is something that the web site operator needs to look at or is it something that I can do from my end?

DM

As mentioned in that article:

When ViewState in your page become very large it can be a problem as some firewalls and proxies will prevent access to pages containing such huge ViewState sizes

There are 2 possible solutions, if indeed this is this issue (and their ViewState is ridiculously large BTW)

1) Find a setting in your router/firewall that's limiting the size of post-back data (the data your web browser sends in the HTTP request), and change/disable it. Note it may not be a user setting though - it could just be a hard limit.

2) InvadeIT fix their website so it either doesn't use ViewState, or at least controls it's size.

Edit: Here's an actual example of the ViewState data InvadeIT expect your web browser to post-back when adding an item to their cart:

__EVENTARGUMENT __EVENTTARGET ctl00$ContentPlaceHolder_Main$Button_Basket __VIEWSTATE

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@InvadeIT: if you're reading this, tell your dev to use session state instead of view state, problem solved.

B. H*ll - that's enormous. I'll email Thomas at InvadeIT and ask him to take a look.

DM

[doctormann]

I think we can probably say this is a connection issue to ASP servers. (Both InvadeIt and Catalog-7 run ASP)

It may be that packet data is being dropped, possibly from oversized packets that are then truncated.

@DM, I'd like to you try two separate experiments:

Set your router MTU to 1100. reboot and test.

Set your router and PC to matching MTU: 1492 (or smaller; 1400)

Your streaming issue may related. Probably. Possibly.

I shall try this at some stage. Bit busy today - maybe later.

DM

Right, here's the update. I haven't quite done what you requested but I have done this:

1. Carried out MTU test on the WIN7 machine. Packets were fragmenting - reduced MTU from 1500 (default) to 1488. This was the highest setting that did not give fragmentation.

2. Set MTU on WIN7 to 1488.

3. Couldn't find out how to test MTU on Linux Mint but set it to 1488 anyway,

4. Rebooted router and both PCs.

InvadeIT and BBC iPlayer sites now working perfectly at this time.

5. At this point the router MTU was still set to 1492 (default). Changed this to 1488, rebooted.

Now, although InvadeIT was still OK on both machines, BBC failed on WIN7. Very odd!

6. Reset router to 1492, rebooted.

Everything now OK - only tested on Chrome browser by the way.

So, it was an MTU problem - although I still don't really understand what's going on.

One thing that I forgot to mention before is that the Linux machine is on wifi but the WIN7 machine is wired Ethernet. I don't see why this should make any difference but who knows!

Thanks, everyone, for all the help and suggestions. Maybe we've learned something - I know that I have!

I have emailed Thomas at InvadeIT so maybe his techs will take a look at how their servers are operating.

DM