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This article lists common issues and problems people have with Zandronum, and solutions and workarounds for them.
This article lists common issues and problems people have with Zandronum, and solutions and workarounds for them.


=="Incorrect version"==
==Incorrect version==
This means your Zandronum client is of a different version to the server you are attempting to join. Most servers are running the latest stable release, which can be downloaded from [https://zandronum.com/download Zandronum's download page]. Some servers may be using beta/testing versions which can be downloaded by your server browser and handled separately without overwriting your stable version, see [[Setting up testing versions]].
This means your Zandronum client is of a different version to the server you are attempting to join. Most servers are running the latest stable release, which can be downloaded from [https://zandronum.com/download Zandronum's download page]. Some servers may be using beta/testing versions which can be downloaded by your server browser and handled separately without overwriting your stable version, see [[Setting up testing versions]].


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*'''Doom Explorer:''' Open the Options from the top menu. Then select Programs. Ensure Zandronum's path is set correctly, and use the Change button to fix it if necessary.
*'''Doom Explorer:''' Open the Options from the top menu. Then select Programs. Ensure Zandronum's path is set correctly, and use the Change button to fix it if necessary.


=="Level authentication failed"==
==Level authentication failed==
This means that the level data on your computer is different to the level data on the server.  
This means that the level data on your computer is different to the level data on the server.  


Firstly, ensure you are not using Freedoom, as Freedoom's maps are entirely different to and incompatible with vanilla maps. Most servers require a registered version of the game IWAD to play. If you are using the actual game's IWAD, ensure it is the correct version. You can use a tool such as [https://drinkybird.net/doom/omniscient Omniscient] to patch your IWAD files to the correct version. Pretty much all Doom servers use The Ultimate Doom 1.9, and all Doom 2 servers use version 1.9.
Firstly, ensure you are not using Freedoom, as Freedoom's maps are entirely different to and incompatible with vanilla maps. Most servers require a registered version of the game IWAD to play. If you are using the actual game's IWAD, ensure it is the correct version. You can use a tool such as [https://drinkybird.net/doom/omniscient Omniscient] to patch your IWAD files to the correct version. Pretty much all Doom servers use The Ultimate Doom 1.9, and all Doom 2 servers use version 1.9.


If the issue still occurs, it is likely one of your mod files is of an invalid version or even corrupt: see the [[#"Protected_lump_authentication_failed"|Protected lump authentication failed]] section,
If the issue still occurs, it is likely one of your mod files is of an invalid version or even corrupt: see the [[#Protected_lump_authentication_failed|Protected lump authentication failed]] section,


=="Protected lump authentication failed"==
==Protected lump authentication failed==
[[File:Protected lump auth failure.png|thumb|Example of a protected lump authentication failure]]
[[File:Protected lump auth failure.png|thumb|Example of a protected lump authentication failure]]
This occurs when the files loaded by your client do not match the files loaded by the server. The usual solution to this problem is simple: delete the mismatched files, and re-download them. When downloading files using Wadseeker or GetWAD, pay close attention to which website the files are downloaded from - if a specific site keeps serving up invalid files, you might want to remove it from your server browser's settings.
This occurs when the files loaded by your client do not match the files loaded by the server. The usual solution to this problem is simple: delete the mismatched files, and re-download them. When downloading files using Wadseeker or GetWAD, pay close attention to which website the files are downloaded from - if a specific site keeps serving up invalid files, you might want to remove it from your server browser's settings.