Support for Windows Products
Support for Windows Products
How To Fix Error 0x21
If you have Error 0x21 then we strongly recommend that you download and run this (Error 0x21) repair tool.
Symptoms & Summary
Error 0x21 and other critical errors can occur when your Windows operating system becomes corrupted. Opening programs will be slower and response times will lag. When you have multiple applications running, you may experience crashes and freezes. There can be numerous causes of this error including excessive startup entries, registry errors, hardware/RAM decline, fragmented files, unnecessary or redundant program installations and so on.
In order to fix your error, it is recommended that you download the 'Error 0x21 Repair Tool'. This is an advanced optimization tool that can repair all the problems that are slowing your computer down. You will also dramatically improve the speed of your machine when you address all the problems just mentioned.
Recommended: In order to repair your system and Error 0x21, download and run Reimage. This repair tool will locate, identify, and fix thousands of Windows errors. Your computer should also run faster and smoother after using this software.
File Size 746 KB
Compatible Windows XP, Vista, 7 (32/64 bit), 8 (32/64 bit), 8.1 (32/64 bit) Windows 10 (32/64 bit)
By: Warwick Black Applies To: CitectSCADA5.31, 5.40, 5.41, 5.42, 5.50, 6.0, 6.1, 7.0 CitectHMI5.31, 5.40, 5.41, 5.42, 5.50, 6.0, 6.1, 7.0 Summary: I have a project with MODBUS Serial devices on COM1 and COM4. If I start this project on a PC that does not have a COM4 port, but does have a COM1 port, I get the following errors: These Error messages come up multiple times (once for each port defined). After acknowledging these error messages, Citect will load up, but NONE of my Serial MODBUS devices will ever come online. Even the Serial Devices on the Existing COM port display #COM. If I also have an Ethernet Device configured in my project, then I will get a different error message on startup. Instead of the two shown above, I will receive: This will come up multiple times (once for each Serial Port), and after Citect loads, still none of my Serial devices will come online. However, my Ethernet devices do come online successfully. How can I have Citect ignore the device on the non existent Serial Port, and bring the existing ones online? Solution: The above situation can also be true for the case where a 'Virtual COM Port' is being used (i.e sometimes it may not exist, but later it will be created). The resolution for this is to add the following special options to the Port's form of all the Serial Ports: This special option allows the COMX driver tonot terminate at startup if an error occurs. It will also let the driverkeep retrying to init the driver until the Port is available. This will allow your existing Serial Devices to com online, and display #COM for the non-existant ones. If you are using 'Virtual Serial Ports' (possibly to an Ethernet gateway etc) this will also allow the device on your non-existent 'Virtual Serial Port' to come online once the port is made available/ is started. Keywords: Related Links Attachments © Schneider Electric (Australia) Pty Ltd Disclaimer
Tips New Here? Please read this important info!!! PLCS.net - Interactive Q & A > PLCS.net - Interactive Q & A > LIVE PLC Questions And Answers Vijeo Citect HMI Error User Name Remember Me? Password Register FAQ Calendar Downloads PLC Reviews PLCS.net Store Today's Posts Search Search Forums Show Threads Show Posts Advanced Search Go to Page... Thread Tools Display Modes November 13th, 2012, 01:36 AM #1 Yna Member Join Date: Jul 2012 Location: Metro Manila Posts: 36 Vijeo Citect HMI Error Hi guys! I encountered an error http://proscada.ru/ctkbase.en/articles/q5039.html on vijeo citect HMI. The system is configured as main and standby HMI. I have this error on standby HMI, "ERROR 0x21 ON OPENING 'PORT1_BOARD2_SBY' FOR PROTOCOL 'MODNET' ". This error occurs if I run the the citect on first attempt. Upon closing the error dialog box and re-running the citect on the second time, the error is no longer available and I can run the citect....but if I http://www.plctalk.net/qanda/showthread.php?t=75530 exit again and run the citect, the error occurs again. I have to close it again and rerun the citect.. Same configuration both main & standby, but error occurs only on standby. How can I fixed it? Thank you in advance.. Yna View Public Profile Find More Posts by Yna January 3rd, 2013, 04:48 AM #2 IainH Member Join Date: Jul 2008 Location: Sussex Posts: 44 It may not be relevant, but I have had the same error number when starting a project using MODBUS protocol and it was due to the serial port specified for MODBUS not being available. Can you check that the port you are using is available and free before you start the project? Iain IainH View Public Profile Find More Posts by IainH Jump to Live PLC Question and Answer Forum Bookmarks Twitter Reddit Digg del.icio.us StumbleUpon Google « Previous Thread | Next Thread » Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Posting Rules You may not post new threads You may not post replies You may not post attach
DriverDoc WinSweeper SupersonicPC FileViewPro About Support Contact Errors Troubleshooting › Blue Screen Errors › Microsoft Corporation › Windows Operating System › QUOTA_UNDERFLOW (Error 0x21) How To Fix QUOTA_UNDERFLOW Blue Screen Errors http://www.solvusoft.com/en/errors/blue-screen-errors/microsoft-corporation/windows-operating-system/bug-check-0x21-quota-underflow/ (0x00000021) Error Number:Error 0x21 Error Name:QUOTA_UNDERFLOW Error Description:The QUOTA_UNDERFLOW bug check has a value of 0x00000021. This indicates that quota charges have been mishandled by returning more quota to a particular block than was previously charged. Hexadecimal:0x00000021 Developer:Microsoft Corporation Software:Windows Operating System Applies to:Windows XP, Vista, 7, 8, and 10 Download NowWinThruster 2015 - Scan your PC for error 0x21 computer errors. Compatible with Windows 10, 8, 7, Vista, XP and 2000 Symptoms of QUOTA_UNDERFLOW Blue Screen Errors “QUOTA_UNDERFLOW” appears and crashes the active program window. "STOP Error 0x21: QUOTA_UNDERFLOW" is displayed. A problem has been detected and Windows has been shut down to prevent damage to your computer. The problem seems to be caused by the following error 0x21 file: Your PC frequently crashes with Error 0x21 when running the same program. “The QUOTA_UNDERFLOW bug check has a value of 0x00000021. This indicates that quota charges have been mishandled by returning more quota to a particular block than was previously charged.” is displayed. Windows runs sluggishly and responds slowly to mouse or keyboard input. Your computer periodically “freezes” for a few seconds at a time. In most cases, you will experience QUOTA_UNDERFLOW blue screen errors after you’ve installed new hardware or software. These QUOTA_UNDERFLOW blue screens can appear during program installation, while a Microsoft Corporation-related software program (eg. Windows Operating System) is running, while a Windows driver is being loaded, or during Windows startup or shutdown. Keeping track of when and where your STOP error occurs is a critical piece of information in troubleshooting the problem. Causes of QUOTA_UNDERFLOW Blue Screen Errors Incorrectly configured, old, or corrupted device drivers. (very common) Corruption in Windows registry from a recent software change (install or uninstall). Virus or malware infection that has corrupted WindoNo related pages.
There are many reasons why Error 0x21 happen, including having malware, spyware, or programs not installing properly. You can have all kinds of system conflicts, registry errors, and Active X errors. Reimage specializes in Windows repair. It scans and diagnoses, then repairs, your damaged PC with technology that not only fixes your Windows Operating System, but also reverses the damage already done with a full database of replacement files.
A FREE Scan (approx. 5 minutes) into your PC's Windows Operating System detects problems divided into 3 categories - Hardware, Security and Stability. At the end of the scan, you can review your PC's Hardware, Security and Stability in comparison with a worldwide average. You can review a summary of the problems detected during your scan. Will Reimage fix my Error 0x21 problem? There's no way to tell without running the program. The state of people's computers varies wildly, depending on the different specs and software they're running, so even if reimage could fix Error 0x21 on one machine doesn't necessarily mean it will fix it on all machines. Thankfully it only takes minutes to run a scan and see what issues Reimage can detect and fix.
A Windows error is an error that happens when an unexpected condition occurs or when a desired operation has failed. When you have an error in Windows, it may be critical and cause your programs to freeze and crash or it may be seemingly harmless yet annoying.
A stop error screen or bug check screen, commonly called a blue screen of death (also known as a BSoD, bluescreen), is caused by a fatal system error and is the error screen displayed by the Microsoft Windows family of operating systems upon encountering a critical error, of a non-recoverable nature, that causes the system to "crash".
One of the biggest causes of DLL's becoming corrupt/damaged is the practice of constantly installing and uninstalling programs. This often means that DLL's will get overwritten by newer versions when a new program is installed, for example. This causes problems for those applications and programs that still need the old version to operate. Thus, the program begins to malfunction and crash.
Computer hanging or freezing occurs when either a program or the whole system ceases to respond to inputs. In the most commonly encountered scenario, a program freezes and all windows belonging to the frozen program become static. Almost always, the only way to recover from a system freeze is to reboot the machine, usually by power cycling with an on/off or reset button.
Once your computer has been infected with a virus, it's no longer the same. After removing it with your anti-virus software, you're often left with lingering side-effects. Technically, your computer might no longer be infected, but that doesn't mean it's error-free. Even simply removing a virus can actually harm your system.
Reimage repairs and replaces all critical Windows system files needed to run and restart correctly, without harming your user data. Reimage also restores compromised system settings and registry values to their default Microsoft settings. You may always return your system to its pre-repair condition.
Reimage patented technology, is the only PC Repair program of its kind that actually reverses the damage done to your operating system. The online database is comprised of over 25,000,000 updated essential components that will replace any damaged or missing file on a Windows operating system with a healthy version of the file so that your PC's performance, stability & security will be restored and even improve. The repair will deactivate then quarantine all Malware found then remove virus damage. All System Files, DLLs, and Registry Keys that have been corrupted or damaged will be replaced with new healthy files from our continuously updated online database.
Downloads in December: 361,927
Download Size: 746KB
To Fix (Error 0x21) you need to follow the steps below:
Download Error 0x21 Repair Tool
Click the "Scan" button
Click 'Fix All' and the repair is complete.
Windows Operating Systems:
Compatible with Windows XP, Vista, Windows 7 (32 and 64 bit), Windows 8 & 8.1 (32 and 64 bit), Windows 10 (32/64 bit).