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Proxy Server Error Code 20

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proxy server error code 20, how to fix – Microsoft Community

First, in some cases, the issue is related to a bad time and date setting on your computer.. Check to make sure your computer time and date are correct.. If not, fix them and if necessary, replace your CMOS battery to keep the date correct.
Next, see the link below to make sure the server certificate is up to date and installed on your computer. (It may have changed. ) Generally, contacting the server’s IT folks will allow you to get this fixed quickly.
Error message when Outlook tries to connect to a server by using an RPC connection or an HTTPS connection: “There is a problem with the proxy server’s security certificate”
Hal Hostetler, CPBEBroadcast Engineer/IT ProMVP-Outlook – WA7BGX
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How to fix error code 20 on Outlook - Windows Report

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How to fix error code 20 on Outlook – Windows Report

Matthew is a freelancer who has produced a variety of articles on various topics related to technology. His main focus is the Windows OS and all the things surrounding it. He is passionate about… Read more
Updated: Apr 1, 2020
Posted: October 2017
Error code 20 is an error message that occurs when you’re trying to send emails using Outlook. This issue occurs when the software can’t connect with the proxy error can often be due to a laptop’s or desktop’s date and time settings. Check if that Windows is displaying the correct time and date. Outlook errors are, unfortunately, pretty common, but you cannot let this ruin your day. Go to our Outlook errors section for a complete list of possible errors and you still didn’t find the solution, check our Fix Outlook issues category for more articles.
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Error code 20 is an error message that occurs for some Outlook users when sending emails.
When they try to send an email, the application returns this error message, Outlook is unable to connect to the proxy server (error code 20).
This issue occurs when the software can’t connect with the proxy server. So does that error message sound familiar? If so, here are a few potential resolutions for error code 20.
How can I fix error code 20 on Outlook?
1. Check Windows’ Date and Time Settings
Error code 20 can often be due to a laptop’s or desktop’s date and time settings.
Check that Windows is displaying the correct time and date. If not, this is how you can configure the date and time settings in Windows 10.
Click the Cortana button on the taskbar, and enter date & time in the search box.
Select Date & time settings to open the window shown directly below.
To manually configure the date and time, switch the Set time automatically setting to off if it’s currently selected.
Press the Change button to open the window directly below.
Then configure the date and time settings there as required, and press the Change button.
You might also need to replace the desktop’s or laptop’s CMOS battery, which keeps the time.
Check out this post for further details on how to fix the system clock in Windows.
2. Run a System File Checker Scan
The System File Checker tool in Windows fixes corrupt system files. Error code 20, like many other software issues, can be due to corrupted system files. This is how you can scan system files with the SFC tool in Windows.
Press the Win key + X hotkey, and click Command Prompt (Admin).
First, enter /Online /Cleanup-image /Restorehealth in the Command Prompt; and press the Return key.
Then input sfc /scannow in the Prompt’s window, and press the Enter key to initiate the scan.
When the scan is complete, restart the OS if Windows Resource Protection repaired some files.
3. Run an Anti-Virus Scan
It might also be the case that a virus or malware is responsible for error code 20. There are myriad third-party anti-virus utilities you can utilize to scan for viruses.
If you don’t have any anti-virus software currently installed, run an anti-virus scan with Windows Defender as follows.
Press the Cortana button to open that app’s search box.
Enter ‘Windows Defender’ in the search box, and select to open the Windows Defender window shown directly below.
Click the shield icon on the left of the window to open scan options.
Press the Quick scan button to open further settings.
Then select the Full scan option for the most thorough scan.
Press Scan now to initiate the scan.
You might be also interested in our article about 9 best antivirus software with encryption to secure your data
4. Turn off Firewalls
Run a System Scan to discover potential errors
Click Start Scan to find Windows issues.
Click Repair All to fix issues with Patented Technologies.
Run a PC Scan with Restoro Repair Tool to find errors causing security problems and slowdowns. After the scan is complete, the repair process will replace damaged files with fresh Windows files and components.
Windows and third-party software firewalls block software from making connections.
Thus, a firewall blocking Outlook could be responsible for the code 20 error, which is a proxy server connection issue. This is how you can switch Windows Firewall off.
Enter the keyword ‘Windows Firewall’ in Cortana’s search box.
Click Windows Firewall to open its Control Panel tab below.
Click Turn Windows Firewall on or off to open further settings.
Select the Turn off Windows Firewall option and click OK.
If switching the firewall off resolves the issue, click Allow an app or feature through Windows Firewall on the Windows Firewall tab.
Press the Change settings button, and then scroll down to Outlook in the listed software.
Click both Outlook‘s check boxes if they’re not currently selected.
Press the OK button to close the Allowed applications tab.
Select the Turn on Windows Firewall option, and press the OK button.
Your third-party anti-virus utility might also have a firewall that’s blocking Outlook.
To switch its firewall off, right-click the anti-virus utility’s notification area icon on the right side of the taskbar.
You can usually select a disable or stop option to temporarily switch the software off with from the context menu.
5. Reinstall Outlook
Uninstalling and installing Outlook again is another potential fix for error code 20. Reinstalling Outlook will give the application a fresh configuration and replace its program files.
You can uninstall the software by pressing the Win key + R hotkey and entering in Run.
Then click OK, select Outlook on the Programs and Features tab, and press the Uninstall button. Thereafter, restart Windows before reinstalling the email application.
Those are a few fixes that might resolve error code 20 so that Outlook sends emails again.
You can also try fixing the issue with the Microsoft Support and Recovery Assistant or Stellar Phoenix software.
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Frequently Asked Questions
What is an error code 20?
The Error code 20 in Outlook is an error message that occurs when you’re trying to send emails. This issue occurs when the software can’t connect with the proxy server. If you can’t connect to the proxy server, use this expert guide to fix this problem.
Why am I getting a send/receive error in Outlook?
Windows Firewall and any third party Antivirus program can interfere with sending and receiving emails on Outlook. Therefore, if you want to fix this error, try to disable the Firewall and the Antivirus program.
Where is my outbox in Outlook 365?
Right-click on Outbox and pick Show in Favorites. Now, when you open Outlook via Office365 OWA you will see Outbox displayed under the Favorites menu. If it doesn’t open, we have a guide to help you fix that.
Fix: Outlook Error Code 20 Unable to connect to Proxy Server

Fix: Outlook Error Code 20 Unable to connect to Proxy Server

MS Outlook is a personal information management software that was introduced by Microsoft primarily to be used as an E-mail application. Quite recently, an error has been reported frequently by users that Outlook is prevented from being able to connect to its proxy server due to an Error Code 20 that states “There is a problem with the proxy server’s security certificate. Outlook is unable to connect to the proxy server “. After analyzing some case studies and studying user input, we have compiled some fixes and solutions that have been proven to get rid of this MessageWhat causes Error Code 20 on Outlook? Some triggers behind the Error Code 20 on Outlook are listed as and Time: You might encounter Error Code 20 on Outlook if the Date and Time are not set properly on your computer. Date and time although seemingly unimportant, play a huge role in verifying the security certificates of websites/servers by matching the current date to their expiration date. Therefore, if the date and time aren’t set properly, the error code 20 might be triggered due to a mismatch of the expiration date of the server’s rrupted Files: Error Code 20 might occur on Outlook if your computer has some corrupted files in some of its directories that are preventing some of its features from working properly. Corrupt Files are never a good sign on a computer and they can often create issues with installations and launch of Microsoft rewall: If Windows Defender Firewall is blocking Outlook then there is a high chance that it will prevent Outlook from establishing a connection with its servers by questioning its security certificate. Firewalls and Antiviruses never simplify the process of allowing through suspected applications and block them entirely even if the suspicion itself is based off of a false you are facing a similar error and are looking for a workaround, you can use the solutions listed as follows to rectify this glitch on your you Start:If you have just encountered Error Code 20, there is a chance that it might have occurred due to poor signal strength of your local internet connection. Therefore, it is recommended that you power cycle your router before moving to any major solution and check if the error is PC Issues AutomaticallyIf you want to have your PC related issues fixed automatically and diagnose, list, and rectify any registry errors, we recommend that you try using the Restoro Repair Tool that can easily do all of this at a single click. It has been rated Great by Trustpilot so you don’t have to worry about the power adapter of your router out of the socket and wait for it to completely shut moving the Plug from the socketIn the meanwhile, change the place of the router where it can get better signal strength. Also, move other electronic devices away from the router that might be interfering with its waiting for a couple of minutes, insert the power adapter of the router back into the socket and start it back for its lights to turn on and check to see if the issue the Error Code 20 on Outlook using the following Solutions:Solution 1: Correct the Date and Time settingsIn most cases, error code 20 occurs on Outlook if the Date and Time are not set properly on your computer. So, in order to get around this problem, follow the steps indexed below to correct the Date and Time setting manually, and check if the error is “Windows” + “I” buttons simultaneously to open “Settings”. Navigate to “Time and Language” and select “Date and Time” and LanguageDisable the toggle button below the “Set time automatically” and the “Set time zone automatically” options and click on the “Change” button. Updating ManuallyNow set the correct date and time and select “Change” to save your Date and TimeIf this doesn’t correct your date and time, replace your CMOS battery to keep the date lution 2: Scan your computer for corrupted filesIt is reported by most of the users that the certificate error arises on Outlook if your computer contains some corrupted files in its directories that prevent some Outlook features from working properly. If this is the case, follow the steps listed below to fix this file the taskbar, click the search button and type “Command Prompt” the icon and click “Run as Administrator” cmd and click on Run as administratorType the following command and hit entersfc /scannowScan your computer for corrupted files When the scanning process is completed, type, and execute the following eanmgrNow select all the drives one by one and click “OK” to scan and fix all of the disk CleanupSolution 3: Allow Outlook to pass through FirewallWindows Firewall is a crucial feature embedded into the Windows that scans the information that is coming to your computer from external sources and filters the harmful content from it. You might encounter “Error Code 20” on Outlook if the Windows firewall is blocking some features of Outlook. So as a solution, allow the application to pass through the firewall by following the steps indexed on the search button in the taskbar, type “Control Panel” and click on the first For Control PanelIn the view by dropdown menu, select “Large icons” Large iconsNow select “Windows Defender Firewall”. Navigate to Windows Defender FirewallOn the left side of the window, select “Allow an App or Feature Through Windows Firewall Defender” from the list of Apps through FirewallNow locate and click on “Change Settings” SettingsCheck both public and private network boxes in front of “Outlook” entries and restart your lution 4: Restore your computer to an earlier dateSystem restore is an essential feature that is integrated into Windows operating systems that allows you to revert your system’s state to an earlier date. If you still encounter error code 20, revert your system to an older state where you didn’t encounter this error message. Follow the steps below to carry this task the search button in the taskbar, type “restore point” and click “Create a restore point” to open store PointClick the “System Restore” RestoreSelect a restore point that was created before you came across this Restore pointNow click on “Next” and then select “Finish”. Solution 5: Update device drivers automaticallyDevice drivers play an important role in maintaining communication between the peripheral devices attached to the computer. You will encounter error code 20 if you are using outdated drivers. So to resolve this issue, update the device drivers automatically by following the steps listed below and check if the error still to your favorite browser and download Driver on the downloaded executable file and install the tool by following the on-screen the “Scan Now” wnload driver easy and click Scan Now optionNow a list will appear that will be comprising all of the outdated drivers on your computer. It is up to you that you update them selectively or collectively by clicking the “Update All” button at the all driversRestart your computer and check if the issue is resolved or lution 6: Perform a quick system scanVirus and Threat protection is a crucial feature of the Windows operating system that protects your system from dangerous malware and viruses that attack your computer and change the way your computer operates. If you still encounter error code 20, then it is always recommended to scan your system for viruses and fix them at the on the search button in the taskbar, search for “Settings”, and navigate to “Update and Security”. Navigate to update and securityFrom the left pane, select “Windows Security” and afterward, click on “Virus and Threat Protection” in the right virus and threat protectionClick on “Quick Scan” and wait for the computer to scan and eliminate the viruses found on your Quick scanSolution 7: Remove incompatible applications and certificatesThere are numerous Softwares that conflict with Outlook when it launches and they tend to prevent it from being able to launch. You will encounter error code 20 if you have installed an incompatible software on your computer. Go through the list of these Softwares indexed below, and remove them from your computer if there are on the search button in the taskbar, type “Control Panel” and open and click on “Uninstall a Program”. Opening the program uninstallerLocate any incompatible application that is mentioned in the list below, right-click on it and select “Uninstall” click on the search button in the taskbar and search for “”cFrom the left pane, navigate to “Trusted Root Certification Authorities” and select “Certificates”. Trusted Root Certification AuthoritiesNow locate all the certificates that contain “DO_NOT_TRUST_FiddlerRoot” in their name and delete of Incompatible applications:SafeGuardRocket TabMalware ScannerSearch ConduitGeniusBoxSUPERAntiSpywareSLOW-PC FighterExpressCacheSearch ProtectAnti-malware toolSolution 8: Boot your computer in safe modeSafe mode is a special boot state that only launches the most important services that are required for startup and it prevents third-party and extra features from loading. If you still can’t get rid of error code 20, then boot your system in safe mode by following the steps listed below and check if the error is the search button in the taskbar, type “msconfig” and open ConfigurationNavigate to the Boot tab and check the box parallel to “Safe boot” bootRestart your computer and check if the problem is lution 9: Validate the CertificateMany users have reported that this error occurs when your server’s configurations are not correct. There might be a chance that your server’s Subject field is different from the site name or it is possible that your server’s certificate has been expired. So to make sure that the server’s certificate is correct, proceed to validate it by following the steps indexed “Internet Explorer” and paste the following link in the address bar. (Note: Replace server_name by the RPC server name or the secure server name) double-click the “Padlock” icon at the bottom-right corner of the Web the “Details” tab check whether the validity date of the certificate is expired in the “Valid to” field. Also, make sure that the data in the “Subject” field should match the site lution 10: Install an antivirus softwareThird-party antivirus software is essential to prevent your computer from malware and viruses that can enter your computer from another source such as the internet or a USB drive. Some times running a quick-scan from the default Antivirus is not enough to completely scan and remove all the viruses on your computer. Therefore, in order to get around this problem, download and install third-party antivirus software and check if the error your favorite browser and download Avast Antivirus on the downloaded file and follow the on-screen instructions to install the it is installed, click on the “Scan Now” button and check if the error is lution 11: Use Stellar Repair to fix corrupted PST filesIn some situations, error code 20 on Outlook indicates that the Outlook PST files are corrupted. Therefore, to rectify this error, you need to repair these PST files. As it is a hectic task to locate these files manually to fix them, it is always recommended to use “Stellar repair” which is a great software that repairs corrupted Outlook PST your favorite browser and download Stellar on the downloaded file and follow the on-screen instructions to install the tool is installed successfully, browse for the PST file and click on the “Repair” button to fix corrupted PST filesSolution 12: Reinstall Outlook on your computerIf you still can’t get rid of Error code 20, then there might be a chance that the installation files of Outlook have somehow gotten corrupted. If this is the case, then the most efficient approach to fixing this issue is to reinstall Outlook on your computer. Therefore, as a solution, follow the steps indexed below to reinstall Outlook on your computer and check if the error is on the search button in the taskbar, type “Control Panel” and open and click on “Uninstall a Program”. Opening the program uninstallerFrom the list, locate “Microsoft Outlook“, right-click on it and select “Uninstall” this, reinstalling Outlook by searching for it online and downloading it on your lution 13: Update your WindowsMicrosoft keeps on pushing updates to Windows and they fix numerous bugs that are present in the older versions. If you still encounter error code 20, then follow the steps listed below to update your Windows and check if the error is on the search button in the taskbar and search for the “Settings” for settingsNow locate and select “Update and Security” Update and securityFrom the left pane, click on “Windows Update” and select “Check for updates” from the right side of the for updatesWait for the computer to automatically check for updates and install them if they are lution 14: Reinstall WindowsIf updating Windows didn’t resolve this error on your computer, then another solution that has helped many users to get around this issue is to reinstall the Windows. The easiest procedure to reinstall the Windows on your computer is to “Reset” your PC. So, follow the steps indexed below to reset your pc and check if the issue is the power button three times consecutively, at the time of startup, to open the “Automatic Repair” screen and click on “Advanced Options” automatic repairClick on the “Advanced Options” button and select “Troubleshoot” on TroubleshootNow select “Reset this PC” PCNow follow the onscreen instructions and wait until your computer is finished with the reset the computer has been reset, check to see if the issue still lution 15: Contact Network SupportIf none of the solutions explained above, helped you rectify this error on your computer then the only option you are left with is to contact your Network support. There might be a chance that there is an issue with the SSL certificate. If this is the case, then fixing this issue is beyond your control. All you have to do is to contact your Network support and explain this issue to them. Ask them to verify your SSL certificate settings and to check for network encryption that is blocking Outlook. Hopefully, the error might have been rectified by now but if you need further assistance, contact here.

Frequently Asked Questions about proxy server error code 20

What is an error code 20?

Error Code 20 indicates a general network failure. It is a general purpose error which indicates that the underlying TCP connection was forcibly closed for some reason unknown to our application.Apr 16, 2020

How do I fix a certificate error in Outlook?

In this articleSymptoms.Cause.Resolution 1: Examine the certificate for error message 1 or 2.Resolution 2: Install the trusted root certificate for error message 3.Resolution 3: Disable the third-party add-in or the third-party browser add-in for error message 4.More information.Jun 3, 2021

What does this mean the Proxy failed to connect to the Web server due to TCP connection timeout?

It might be due to an issue with the request taking too long or due to issues with the local upstream provider. IP Blockage: If you have made a server, make sure that all the IPs are whitelisted and they aren’t being blocked by an Antivirus or Anti-malware program that is installed on the computer.Nov 14, 2019

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