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Dcom poll problem

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jokke

Technical User
Mar 10, 2002
1
FI

I have investigated "very interesting" DCOM promlem. I don't know if this bug on DCOM or is somehow home made problem.

We have built this client keep-alive messages to the DCOM server to indicate that it's still available and the connection is in good shape, however time to time we lose client connection.

After further investigation, we found in the missing bytes from ack on poll message (from client to server) is missing 8 bytes (see doc corrupted_poll_reply). In the file you see the request and the reply message



Common for these message is that always the alloc_hint is missing for the corrupted messages.
Who knows what "alloc_hint" is inside these dcom-messages?

Why would, for the same reply, alloc hint would sometimes be 0 and sometimes different?

The alloc_hint field may be used by the transmitter as a hint to the receiver, informing it how much buffer space, in units of octets, to allocate contiguously for fragmented requests. This is only a potential optimisation; a receiver is required to work correctly regardless of the value passed. The value 0 (zero) is reserved to indicate that the transmitter is not supplying any information


Thank you for the info,
BR,

Jokke
 
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