Read Error Occurred During Connection Attempt
27001; connection attempt Technote (troubleshooting) Problem(Abstract) This article describes three common causes for listener-thread: err = -27001: Read error occurred during connection attempt errors. Symptom This error appears in the IBM Informix Dynamic Server (IDS) message log file (ONCONFIG configuration file parameter MSGPATH) and users are not able to connect to the database server.: listener-thread: err = -27001: Read error occurred during connection attempt. Resolving the problem Common causes and solutions for the error are: 1. The connectivity files in the /INFORMIXTMP directory are not removed. The files are in the form of : VP. server_name .0100a server_name Database server name as was set in INFORMIXSERVER environment variable and associated with the tcp connections. Solution: Stop the database server, remove the files from the /INFORMIXTMP directory, and start the database server. 2. The ONCONFIG file settings for the NETTYPE parameter are not correct. This error is widely seen involving tcp network connections when the VP class in the NETTYPE setting is set for CPU vp. Solution: As a work around Change the vp class setting for the NETTYPE configuration parameter from CPU to NET. Factors outside of Informix that can cause 27001 3. An operating system resource limit was reached. Kernel parameters settings require changes. Solution: Check and possibly increase settings for the following kernel parameters or parameters equivalent to them depending on Unix platform: NOFILES SEMMNU NFILES MAXFILES MAXFILE_LIM 4. Network problem. Perhaps the network is busy or packets are being lost. Monitor network and alleviate the problem. 5. Hardware involved in the system ( network card, cables, router, and so on ) is intermittently failing and causing the error. Document information More support for: Informix Servers Software version: 7.3, 9.4, 10.0, 11.1, 11.5 Operating system(s): AIX, HP-UX, Linux, OS X, Solaris, Windows Reference #: 1165598 Modified date: 03 May 2004 Site avai
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your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select http://www.dbforums.com/showthread.php?1051522-27001-Read-error-occurred-during-connection-attempt the forum that you want to visit from the selection below. Results 1 to http://www.oninit.com/errorcode/index.php?idx=23 9 of 9 Thread: -27001 Read error occurred during connection attempt Tweet Thread Tools Show Printable Version Subscribe to this Thread… Search Thread Advanced Search Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 10-28-04,05:21 #1 pdraycott View Profile View Forum Posts Registered User Join Date Oct 2004 Posts 5 Unanswered: -27001 Read error read error occurred during connection attempt Hi, We are using Informix Dynamic Server 2000 on SCO Openserver 5. We keep getting -27001 Read error occurred during connection attempt error messages every couple of days. We use an IIS5 web server to connect to Informix using the Informix Iconnect ODBC driver (2.81). I have tried to sort this out myself, but I have failed. In the onconfig file there are 2 nettype lines :- read error occurred NETTYPE ipcshm,1,200,CPU # Configure poll thread(s) for nettype NETTYPE tlitcp,1,20,NET # Configure poll thread(s) for nettype I think the tlitcp line doesn not have sufficient poll threads. We have about 50-100 people who access the informix database through a web page. Should i increase the number to 100? Cheers, paul Reply With Quote 10-28-04,09:25 #2 pathri View Profile View Forum Posts Registered User Join Date Apr 2004 Location zxczxczxc Posts 52 -27001 Read error occurred during connection attempt Hi Paul, In the NETTYPE there are only 20 concurrent users configured. You can increase it to 100-250 to handle your 50-100 users. The configuration would be like NETTYPE tlitcp,1,200,NET Bye. zxczxczc Reply With Quote 10-28-04,09:27 #3 artemka View Profile View Forum Posts Registered User Join Date May 2004 Location New York Posts 248 Do you get this error on the server or on the client side? You can try increasing the poll threads and see if that helps Reply With Quote 10-28-04,09:57 #4 pdraycott View Profile View Forum Posts Registered User Join Date Oct 2004 Posts 5 I have now changed the nettype to NETTYPE tlitcp,1,200,NET I will see if this cures the error. Thanks to pathri and artemka! Reply With Quote 11-03-04,09:39 #5 pdraycott View Profile View Forum Posts Registered User J
server-name is not listed as a dbserver name in sqlhosts. -25556 Invalid sqlhosts file format. -25557 Network internal error. -25558 The NFS/RFS host host-name is not listed as a dbserver name in sqlhosts. -25559 DBPATH server server-name is not listed as a dbserver name in sqlhosts. -25560 Environment variable INFORMIXSERVER must be set. -25561 Invalid authentication type. -25565 Cannot get process information. -25566 System time error. -25567 Internal communications buffer management error detected. -25568 Debugging utility error. -25570 Network driver cannot execute the fork system call. -25571 Exceeded the maximum number of user threads. -25572 Network driver cannot bind a name to the port. -25573 Network driver cannot accept a connection on the port. -25574 Network driver cannot open the network device. -25575 Network driver cannot allocate the call structure. -25576 Network driver cannot allocate the return structure. -25577 Network driver cannot get a host structure. -25578 Network driver cannot disconnect from the network. -25579 Network function was issued in the wrong sequence. -25580 System error occurred in network function. -25581 Transport Layer memory free error. -25582 Network connection is broken. -25583 Unknown network error. -25584 Network driver cannot access the server program program-name. -25585 Invalid buffer size. -25586 Network send failed. -25587 Network receive failed. -25588 The appl process cannot connect to Dynamic Server 2000 . -25589 Invalid Dynamic Server 2000 mail-box message type. -25590 Authentication error. -25591 Transport control received an invalid connection address. -25592 Communications service not supported by network driver. -25593 Network listener failed to make an open I/O channel to be non-blocking. -25594 Shared Memory client failed to alert Dynamic Server 2000 for service. -25595 Invalid message received during connection attempt. -25596 The INFORMIXSERVER value is not listed in the sqlhosts file or the Registry. -25597 Error in system pipe processing. -25598 Communications usage error: Invalid state transition. -25599 Network connection error - no listener. -27001 Read error occurred during connection attempt. -27002 No connections are allowed in Dynamic Server 2000 quiescent mode. -27003 Internal Communications Error: internal inconsistency detected. -27004 Illegal sqlhosts file option/parameter, parameter, for dbservername, servername. -27005 Illegal sqlexecd daemon option, option_value. Copyright Privacy