My client occassionally receives "connection rejected by remote interface"
error while trying to connect to the remote server. I know that incompatibility
of versions between gds32.dll/fbclient32.dll and server version can create such
errors, but those are deterministic errors that happens always. In my case the
error appears and disappers.
I checked:
- CPU, RAM consumption by the Fireird service is normal
- there are no errors in firebird.log
- there are no antiviruses or firewalls
- telnet server 3050 is OK and ping is also OK
- the error happens during connection time only, once the user is connected to
the server, the connection remains and there are no problems.
This is Firebird 2.1 on Linux machine, but such errors can happen with later
version as well, web has many request for help.
There is the following code in the Firebird sources:
{335544421, "connection rejected by remote interface"}, /* 101, connect_reject
*/
const ISC_STATUS isc_connect_reject = 335544421L;
#define isc_connect_reject 335544421L
inet.cpp / xnet.cpp / wnet.cpp
rem_port* INET_analyze(Firebird::PathName& file_name,... {
...
PACKET* packet = &rdb->rdb_packet;
...
rem_port* port = inet_try_connect(packet, rdb, file_name,
node_name, status_vector, dpb, dpb_length);
...
if (packet->p_operation != op_accept)
{
*status_vector++ = isc_arg_gds;
*status_vector++ = isc_connect_reject;
*status_vector++ = 0;
disconnect(port);
return NULL;
}
...
}
OK, the conclusions are that "connection rejected by remote interface" happens
when there is no op_accept, i.e. Firebird does not try to analyse or
log/journal the real status of p_operation and the cause why the p_operation is
not op_accept. Essentially, this is code block that should have never been
reached and that is why it is not elaborated.
However - such errors happen and what to do in those case? Are there some
Linux logs that journals off the cases when p_operation is not op_accept. And
essentially - as I can understand, then the cited code occurrs on the client
machine, so, there can be network errors as well, but why Firebird code puts
all the blame on the rejection of the server?
So confused...
