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SAP R/3 login problem through tunnel

Hi friends,

Just a peculiar problem with logging into SAP R/3 through a tunnel

Remote Clients are unable to login to SAP R/3 Ver 4.7 server at central office. However, they are able to ping to the SAP server!!

The following are the details:

Remote End router : Cisco 2610 IOS : 12.0(5)XK1

Central office router : Cisco 1721 IOS : 12.3(5e)

A tunnel has been configured on both ends with IP address range of

10.1.1.0 / 30. I am able to ping from one tunnel to the other.

However, with another alternative link (Leased Line) without tunnel confuguration, the remote clients are able to access the SAP server.

I changed the MTU settings for the tunnel interfaces to 1500, but it did not work.

I would also like to add that there is one more remote location router with IOS 12.4(3b) that is having successful SAP server connectivity with central office router in a tunnel configuration.

So, I strongly suspect the IOS version being a cause here. But I am not really in a position to upgrade the IOS from 12.0 to a higher version as I only have 8MB of flash memory.

Are there any options that I can try in this scenario? Thanks a lot for your help in advance.

Thanks a lot Gautam