cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
619
Views
0
Helpful
6
Replies

877 Web browsing issues after an hour or two

maurice.walsh
Level 1
Level 1

Hi All,

I've got a customer who has a Cisco 877 router connected to the Internet via ADSL with an account from a company called Gateway. The router is handling web browsing for about 15 clients on the LAN and is also port forwarding https (OWA) and PPTP to an Internal server. Over the last few days we have had major issues with the router / Internet connection.

  • Internal clients will not be able to connect to web sites, but pinging addresses on the Internet is fine.
  • External clients will not be able to connect to the PPTP server (or will get disconnected of already connected).
  • External clients will not be able to connect to Outlook (using RPC over HTTPS).

This normally happens anywhere between 30 mins to an hour after the router is rebooted. When the above happens, I get kicked out of telnet (from externally) but I can reconnect using straight away and I can VNC (using port forwarding) to the Internal server. I've tried shutting down the ATM, VLAN1 and Dialer0 interfaces and restarting them, but it doesn't help, the only way I've found to sort it out is to do a reload on the router. I've tried setting the mtu and adjust-mss, but these have made no difference.

This also happened just before Christmas (when the site had a 837), we replaced the 837 with a 877 and the problem seemed to go away, but now it's back, I think it was because things were quiet over the holiday period.

Can anyone suggest where I should be looking to try and sort this problem.

Thanks

Maurice

6 Replies 6

cadet alain
VIP Alumni
VIP Alumni

Hi,

I get kicked out of telnet (from externally) but I can reconnect using straight away

What do you mean by that?

Regards.

Alain.

Don't forget to rate helpful posts.

As I am not on site, I telnet in to the router using the Public IP address to monitor the router (temporarily allowed while trying to sort this out), when it goes wrong the telnet session disconnects, but I can telnet back in straight away.

Maurice

Hi,

Can you do this:

logging buffered info

clear log

show log to verify it's enabled and empty

then wait till disconnects and when telnet is back again do a show log and post results here.

Regards.

Alain.

Don't forget to rate helpful posts.

The link stayed up for just over an hour this time, my telnet and pptp session dropped out, I can reconnect using telnet but not pptp and web browsing from the Internal network is also down, as is Outlook web access from the Internet.

One thing that's strange is that I can still VNC to the server on the Internal network (5900 is forwarded), but it does drop out after a minute or so, but it does let me reconnect.

The log shows nothing

Ealing877-2#show log

Syslog logging: enabled (0 messages dropped, 2 messages rate-limited,

                0 flushes, 0 overruns, xml disabled, filtering disabled)

No Active Message Discriminator.

No Inactive Message Discriminator.

    Console logging: level critical, 0 messages logged, xml disabled,

                     filtering disabled

    Monitor logging: level debugging, 0 messages logged, xml disabled,

                     filtering disabled

    Buffer logging:  level debugging, 32 messages logged, xml disabled,

                     filtering disabled

    Logging Exception size (4096 bytes)

    Count and timestamp logging messages: disabled

    Persistent logging: disabled

No active filter modules.

ESM: 0 messages dropped

    Trap logging: level debugging, 36 message lines logged

Log Buffer (51200 bytes):

maurice.walsh
Level 1
Level 1

Another bit of info to throw into the mix, I've set up forwarding on tcp 3389 to the Internal server for RDP, when I cannot web browse / pptp I can still RDP into the server, but it won't stay up for more than a minute or two, it then either hangs or disconnects and reconnects.

Why does VNC / RDP partly work, but pptp / http doesn't ? Could it be to do with packet size ? or the amount of data ?

Maurice

Hi,

Buffer logging:  level debugging, 32 messages logged, xml disabled,

There was messages logged so it is strange you see nothing did you scroll down  your screen?

Without debugs or log messages or a traffic capture it's difficult to diagnose.

Regards.

Alain.

Don't forget to rate helpful posts.