Cisco 877 Blocking Google Play Store & Other Android Apps

Question:

Currently i cannot use many WS-C3750V2-48PS-S Price android apps online, including the Play Store & Spotify.

My desktop, laptop & other network equiptment work fine.

This problem only seems to affect mobile devices.

http://i42.tinypic.com/dvk3fd.jpg

They work via the mobile networks and other wi-fi networks. Its not the wireless as i put in a cheap TP-Link modem and it works straight away.

So it boils down to my Cisco 877

I have upgraded my IOS Software and ADSL Firmware to the latest possible for my model in hope that it would help, but it hasnt.

Its a 128MB/24MB

c870-advsecurityk9-mz.150-1.XA5.bin

adsl_alc_20190_6.0.010.bin

Heres my Running-Config: http://pastebin.com/4atDVJrV

Any help would be greatly appreciated. Surley theres somthing in my config thats stopping it from working.

Answer:

I have studied you captures. I think is a MTU problem. If you study wifi

capture (using ip.addr == 74.125.237.110 as wireshare filter), all application data packets (packet number 334 for expample) are lost (there is no ACK). The only "thing" about this packets is that are long (near to 1500 bytes). Besides in mobile the MSS negotiated is 1394 and in wifi 1430. I do not know in which link the frame is dropped.

To be sure about that the problem please use the commad if the outgoing interface in the internet router:

ip tcp adjust-mss 1400

This command lets router forcing a MSS of 1400 bytes in every TCP negotiation. This command should not cause any problem in the rest of traffic. Please use different values 1400, 1410, WS-C3750V2-24PS-S and son on until you find the maximum value that