mrtg problem

["Anil Gupte" <anil-list@maxnetwork.com>]

I was setting up MRTG on a Debian box and everything was proceeding well for
almost a day.  However, now one of the routers appears to be giving a
problem.  I get this:

SNMP Error:
Received SNMP response with error code
  error status: noSuchName
  index 1 (OID: 1.3.6.1.2.1.2.2.1.10.1797)
SNMPv1_Session (remote host: "w.x.y.z" [216.136.13.254].161)
                  community: "xyz"
                 request ID: 1235825153
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
 at /usr/lib/perl5/SNMP_util.pm line 456
SNMPGET Problem for ifInOctets.1797 ifOutOctets.1797 sysUptime sysName on
xyz@w.x.y.z:
 at /usr/bin/mrtg line 1496
WARNING: Expected a number but got ''
WARNING: Expected a number but got ''

This router was responding fine, like I said for almost an entire day.

Any ideas what is causing this and how I can fix it?

Thanx,
Anil Gupte