The appearance of code 31 when trying to upload an ad or photo on the Avto.ru site most often signals a critical problem with the format or size of the file being processed, which the server cannot interpret correctly. This error is not a random system failure, but is a specific response from the server part of the site to a request containing incorrect data, be it a damaged image file or a broken request structure. Understanding how this code occurs allows the vehicle owner or dealer to quickly resolve the obstacle and successfully post the vehicle for sale, avoiding lengthy downtime.
Unlike authorization errors that require password verification, or network failures, code 31 indicates that data was received by the server, but its content does not comply with the established technical regulations of the platform. This could be due to an attempt to upload a file in an unsupported format, exceeding size limits, or corrupted image metadata during the editing process. In some cases, the problem lies not in the file itself, but in the way it is transmitted through a browser or mobile application, where the cache can distort the data packets being sent.
Ignoring this signal often leads to the user endlessly trying to download the same file, not suspecting that the problem is in its internal structure. To successfully overcome the barrier, it is necessary to diagnose the file, check its extension and weight, and also make sure that the Internet connection is stable at the time of sending the request. Further sections of the article contain a detailed algorithm of actions that will help localize the source of the malfunction and restore normal operation of the ad placement functionality.
Technical reasons for code 31
The fundamental reason for the appearance of code 31 in the Avto.ru system logs is the inconsistency of the incoming data with the specifications of the image and text processing server. When a user uploads a photo of a car, the system automatically validates the file, checking its title, encoding and structural integrity. If the file was edited in a graphical editor and saved in a non-standard mode, or contains hidden layers, the server may identify it as potentially dangerous or unreadable, generating the appropriate error code.
Another common cause is that the browser's clipboard or temporary storage, where data is temporarily placed before being sent, is full. If a large number of junk files or scripts have accumulated in memory, the download process may be interrupted at the request generation stage. Caching old versions of pages or scripts also plays a negative role, forcing the browser to send requests using outdated protocols that are no longer supported by the updated site interface.
⚠️ Attention: Frequently changing the IP address or using anonymizers may trigger the appearance of code 31, since the security system may regard such actions as an attempt at automatic distribution or a spam attack.
In addition, it is worth considering the load on the platform servers during peak hours. During periods of mass posting of advertisements, for example, on weekends or after holidays, the queue for processing files may become full. In this case, the server does not have time to process the request in the allotted time and returns an error code that formally indicates a problem with the file, although in fact the problem is a connection timeout. Usage VPN-services with low speed can also lead to a disconnection at the time of loading, which is interpreted by the system as a data error.
Diagnosing an Image Problem
The first step in eliminating the error should be to carefully check the uploaded photos. The Avto.ru system has strict requirements for file format and parameters, and deviation from them often becomes a trigger for code 31. You need to make sure that the images are saved in a common format JPG or PNG, since the files are in the format HEIC (iPhone standard) or WebP may not be processed correctly by the download module if the browser does not automatically convert them.
File size is also critical. Images that are too large, such as those taken with a high-resolution professional camera, may exceed the user upload limits. Even if a site claims to support large files, internal limitations of the processing scripts may block the loading of objects larger than 10-15 megabytes. It is recommended to pre-compress photos to a reasonable extent while maintaining readability of details.
Technical requirements for photos
Formats: JPEG, PNG. Maximum size: up to 10 MB. Minimum resolution: 640x480 pixels. Aspect Ratio: Not strictly regulated, but horizontal orientation is recommended.
File corruption is another hidden factor. A photo may look fine on a computer screen, but have a damaged title or missing blocks of data that are not visible when viewed normally. Try opening the problematic image in another graphics editor and saving it again, which will often restore the internal structure of the file. It's also worth checking the file name: using Cyrillic, special characters or excessively long names can cause encoding errors on the server side.
Browser and network connection problems
The user's local environment often becomes the source of problems that are mistakenly perceived as failures on the site side. Browsers accumulate a huge amount of temporary data, and a conflict between the old and new versions of site scripts can lead to code 31. Clearing the cache and cookies is a mandatory procedure, since this is where session data and temporary files that can be damaged are stored.
Extensions and plugins installed in the browser can also interfere with the loading process. Ad blockers, script filters, or antivirus add-ons may mistakenly block data from being sent to the server or modify the request, resulting in a validation error. For diagnostics, it is recommended to launch the browser in incognito mode, where extensions are disabled by default, and try to reproduce the action. If the error disappears in this mode, it means that the conflict is caused by one of the installed add-ons.
The stability of the Internet connection is the third key aspect. When using the mobile Internet, the signal may disappear when loading a “heavy” photo, which will lead to a timeout and an error code. Wi-Fi routers can also lose data packets when the channel is overloaded. Switching between network types (for example, from Wi-Fi to 4G) can help determine whether the problem is with a specific provider or equipment.
Use incognito mode to quickly check: if everything works there, the problem is in the cache or extensions of your main browser.
Error resolution algorithm: step-by-step instructions
To systematically solve the problem, it is recommended to adhere to a clear algorithm of actions that eliminates the random method and allows you to quickly localize the problem. You should start with the simplest actions, gradually moving on to more complex technical manipulations. This approach saves time and avoids unnecessary reinstallations of programs.
☑️ Checklist for eliminating code 31
First of all, convert the image. Even if the file is already in JPG format, open it in any editor (Paint, Photoshop, online converters) and save it again, changing the compression quality. This is guaranteed to rewrite the file structure and remove possible hidden errors. After that, try uploading the updated photo to the site.
If manipulating the file does not help, go to your browser settings. Completely clear your download history and cache. In some cases, resetting the browser settings to factory settings helps, but this is a last resort. It is also worth checking whether your system has a date and time that is different from the real one, since time desynchronization can cause security certificate errors.
The table below shows the main symptoms and their corresponding solutions:
| Symptom | Probable Cause | Solution |
|---|---|---|
| The error appears only with one photo | File or format corruption | Converting and resaving an image |
| Error loading any photos | Browser or network problem | Clear cache, change browser |
| Code 31 appears periodically | Unstable Internet | Checking connection, changing network |
| Error after system update | Software version conflict | Updating your browser or OS |
Features of working through a mobile application
Users placing ads through the Avto.ru mobile application may also encounter code 31, but the nature of its occurrence here is often different. Mobile operating systems Android and iOS have their own memory and permission management mechanisms that can block application access to the file system. If the application does not have permission to access the gallery or device memory, attempting to upload a photo will fail.
Additionally, mobile apps often compress images before sending them to save bandwidth. If this process is interrupted or the compression algorithm fails, an incorrect file is sent to the server. Updating the application to the latest version through the official application store (App Store or Google Play) often solves the problem, as developers regularly release patches to fix such bugs.
⚠️ Attention: Make sure that the Avto.ru application has permission to use the mobile network if you are not connected to Wi-Fi. Restricting background data transfer may interrupt downloads.
The full memory of the smartphone itself can also become an obstacle. If your device doesn't have enough space to create a temporary copy of the photo before uploading, the upload process won't start. Freeing up a few hundred megabytes of space may unexpectedly resolve the code 31 problem.
When to contact support
There are situations when independent actions do not lead to results, and the intervention of platform technical specialists is required. If you have tried all the methods: changing browsers, devices, Internet providers, converting photos to different formats, but error code 31 persists, then the problem may be on the server side or in your account. In this case, there is no point in wasting time on further experiments.
Contacting support is also necessary if an error occurs when loading specific types of documents, for example, PTS or STS, which require special processing and verification by moderators. The system may have automatically marked your account or specific files as suspicious due to false positives of security filters, and only a technical support representative can remove this restriction.
If the error is reproduced on different devices and on different networks, the problem is definitely not on your side, write to support.
When contacting support, be sure to indicate which diagnostic steps you have already completed. This will help the operator quickly understand the essence of the problem and not offer you banal solutions like “reboot the router.” Attach screenshots of the error and, if possible, an example of the file that is causing the failure.
Preventing errors when placing ads
To minimize the risk of encountering Code 31 in the future, it is worth developing the habit of preparing content for publication in advance. Using standard smartphone camera settings that are optimized for the web allows you to get photos that load without problems. Regularly updating browsers and mobile applications ensures compatibility with new security standards implemented by the site.
It is also recommended to avoid using public Wi-Fi networks to post important announcements, as they often have bandwidth limitations and may block certain types of traffic. A stable home connection or a strong mobile network signal is the key to successful downloading. Periodically cleaning your device of temporary files helps maintain the performance of programs used to access the site.
Following these simple rules of digital hygiene will allow you to avoid technical hassles and focus on what matters most: selling your car. Remember that code 31 is only a technical signal, which in the vast majority of cases can be resolved by simple steps to check the file and connection settings.
Why won't my photo load even though it's in JPG format?
The file format is just an extension. The internal file may be corrupted or have incompatible color encoding (such as CMYK instead of RGB). Try opening the photo in Paint and saving again.
Can an antivirus block photo uploads to Avto.ru?
Yes, some antivirus programs may regard download scripts as suspicious. Try temporarily disabling your antivirus or adding the site to exceptions.
What to do if the error appears only in the evening?
This may indicate that the servers or your home router are overloaded during peak hours. Try posting your ad in the morning or at night.
Does the file name affect the appearance of code 31?
Yes, files with names containing special characters, emoji or very long names in Cyrillic may not be processed correctly by the server. Rename the file to simple.jpg.
How quickly does technical support respond to such errors?
Usually the answer comes within a few hours during business hours. On weekends, the waiting time may increase to 24 hours.