Hello, My webserver intermittently drops the client connection, how can I determine the root cause of this problem? The server is Apache 2.2 on Suse 10.2. I have implemented a server application which is a C++ binary running under mod_fcgid (1.10). The client is a C++ command line application which may be compiled under either Windows or Linux. Both the client and the server applications are statically linked to gSOAP 2.7.10 which I have configured for FastCGI and zlib. The client sends a query to the server which performs a calculation and sends a response. The client application is deployed to five sites. The query from the client may vary in size. When the query is small, the application always succeeds. When the query is large (i.e. when its compressed size exceeds approximately 10MB), the application fails intermittently. At four of the five client sites the success rate with the larger query varies between 5% and 50%. At the fifth client site the application always succeeds regardless of query size, I'm unable to determine what differentiates this sites from the others. The client application is also installed on the webserver itself, for testing, and that build always succeeds. On failure, mod_fcgid writes this message to the error log: "can't get data from http client". This message originates from function bridge_request() in mod_fcgid following a failed call to ap_get_brigade(). I'm unable to determine the root cause of the failure. I run tcpdump on the server port. A successful query looks like this: 1a) client->server: query - compressed XML containing the request 1b) server->client: ACK 1c) server->client: HTTP 200 OK + compressed XML containing the reponse A failed query looks like this: 2a) client->server: query - compressed XML containing the request 2b) server->client: HTTP 500 Internal Server Error Note that in the case of failure, the request from the client (2a) is received in full on the server port. mod_fcgid fails without invoking the server application. How do I determine the root cause of this problem? Thanks, Eric --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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