Setting up eMule. Extended. Setting up eMule. Extended.

Setting up eMule. Extended.

TCP/IP connections
  • Max. new Connections per 5 seconds
    This is the number of new connections eMule opens during 5 seconds. Default is 20. Messing with this setting can cause blue screens, hung routers and the inability to browse the web. Also Up- and Download may suffer with wrong settings here. You may slightly increase this setting when running eMule on high bandwidth connections like Tx or LAN.
  • Max. Half Open Connections
    This setting became necessary with the connection throttling of Windows XP SP2. This update in XP will only allow 10 half open connections and then starts parking further connections in a queue which is only slowly processed. This leads to timeout and other undesired effects in eMule. If eMule is running on XP SP2 do not set this value any higher than 9. Although there are patches to increase this hardcoded value in XP, it is not recommended to patch such critical parts in Windows. The only effect this setting does have is that eMule acquires sources a bit slower right after startup. This will subside after the sources have been found. In other operating systems like Windows 2000 or the obsolete Windows 95/ME set this value to 50.
  • Fast connection reject
    Fast Connection Reject uses a more efficient method to reject incoming TCP connection attempts of banned clients and/or from clients which IPs are found in IP-filter list. It's using a special Winsock feature called "conditional accept" which leads to less TCP overhead in case the TCP connection is rejected.
  • Server Connection Refresh Interval
    There have been cases reported, that eMule loses the server connection in regular intervals when operating behind a router or network configurations which use NAT - Network Address Translation. Routers often have a timeout for these NATed connections after which the router declares the connection for dead and closes it. When this happens and eMule tries to recheck its server, a full reconnect is needed because the old one has been removed by the router. Should this issue occur, look up the value for the NAT timeout in your router's settings and enter a slightly lower value into the Server Connection Refresh Interval field. A value of 0 means eMule handles this and there is usually no need to change that! Do not mess this this setting unless you have a router or a more complicated network setup. This may get you banned from the servers if the value is too low.

Autotake eD2k Links only during runtime
This option only associates the eD2k link format when eMule is actually up. When eMule is closed the association is deleted to allow uninterrupted working of other eD2k clients.

Use Credit System (Reward Uploaders)
It is strongly recommended to leave the Credit System turned on as it will deter leechers from harming the network.

Open/close ports on Win XP firewall when starting/exiting eMule
eMule is able to automatically open its needed ports in the internal Windows XP firewall. This setting will further increase security by not keeping the ports open after eMule is closed and to open them up again when it is started. This setting is only available in Windows XP and only for the internal firewall, not any third party products. This option does not work correctly in the current Win XP Sp2 RC releases.

Filter server and client LAN IPs
Sources containing IPs of the private IP classes A ( -, B ( -, C ( -, local host ( to and all IPs starting with null (0.x.x.x) are not valid in the internet. Such sources received by client to client source exchange or by servers are dropped when this filter is activated.

Note: Running eMule in a local network (LAN) requires this option be turned off or eMule will not be able to find any sources in this network.

Show more controls (advanced mode controls)
This options activates even more functions in eMule which are usually not needed for running it.

Disable A4AF checks to save CPU
This will turn off any source handling as described in the Advanced Source Handling chapter. Only when a download is canceled, potential A4AF sources are redistributed according to the priorities.

Hostname for own eD2k Links
In the shared files main tab eD2k links with the current IP as source can be created. Entering a hostname in this filed allows to create such links with the hostname instead of the IP. The advantage of this link is that it is still valid should your IP change.

Disable downloading from PeerCache
PeerCache is a system that will cache downloads in a completely anonymous way at the ISP level. This will decrease the amount of traffic an ISP has to cope with by buffering parts of downloads in its own system and so also providing better download speeds for the users. ISPs have to support this feature to be effective.

Create new part files as sparse (NTFS only)
Sparse files are an NTFS (NT File System) feature, thus only available when the harddisk is formatted using NTFS. As the single parts or chunks of a file are not necessarily downloaded in the correct sequence, the space between the already-downloaded parts are filled with zeros. Usually these zeros would eat up space on the harddisk the same way as if they were actually filled with useful data. To prevent this the NTFS sparse file support does not store the zeros but keeps track of where the single parts actually belong in the file. This reduces the diskspace overhead needed during a download. When the file is finished NTFS takes care of the correct sequence of all the parts.

Check Diskspace
The size of eMule's temporary download files increases dynamically on demand. The Check Diskspace option ensures that the current downloads can be entirely downloaded and completed. Downloads which are too big for the current free disk space get paused so that other downloads can be completed. When free disk space increases the paused downloads will restart automatically.

  • Min. free diskspace [MB] If you provide a value for the min. free diskspace eMule's behavior changes. Now all files are downloaded until the limit for free disk space is reached.

Safe .met / .dat file writing
On newer operating systems using NTFS as file system there is usually no need to change this option. If downloads are reproducibly lost on crashes or eMule shut downs the safer method should be tried. Depending on the hardware used, this option may notably increase disk activity / system load or prolong eMule's shut down!

Extract meta data
This feature controls how meta data (bitrate, resolution, codec etc) is extracted from finished/newly hashed files. This data is then published to servers or the Kademlia network. In the search options it can be specified e.g. to search only for mp3 files with a bitrate of at least 128 kb/s.

Save logs to disk
The output of the two log windows of the Server tab - Log and Debug - can be saved to disk by turning on the corresponding option. They will be save as eMule.log or eMule_Debug.log in eMule's installation folder.

If Verbose mode is turned on an additional Debug tab is displayed in the Server window. The information shown therein are for development only and no additional support on these will be provided. This option causes a greater CPU and memory load. Not recommended for normal operation. The Log Level option controls which log messages are shown. Level 5 means all verbose messages whereas level 1 shows only the most important one.

Upload Speed Sense (USS)

USS is a function to monitor the ping times of the connection and to automatically adjust eMule's upload according to this ping value. This ensures that the connection never cloggs and will try to keep surfing and online gaming fluid. It is recommended to keep the default settings.

Please note: It is recommended to set an upload limit in the connection preferences even if USS is enabled. USS will respect the manually set upload limit and never go above that, and knowing the absolute max will help it reach a more stable upload speed.

  • Find best upload limit automatically
    Activates USS
  • Lowest allowed upload speed
    This is the minimum upload USS must keep. Recommended is at least 50% of your upload capacity
  • Ping Tolerance (% of lowest ping)
    A initial average ping is determined for the connection when eMule starts. USS will not allow a ping increase over the initial ping times the entered multiplier, e.g. an initial ping of 50 ms and 800% ping tolerance will result in a maintained maximum ping of 400 ms.
  • Ping Tolerance (ms)
    Instead of calculating the maximum allowed ping by a % modifier also a value in milliseconds can be specified. See next setting.
  • Method for ping tolerance
    Chooses the preferred method for determining the maximum allowed ping. Either the percentage or the millisecond modifier is used.
  • Going up / down slowness
    These two values describe how fast the upload limit is adjusted to stay within the ping tolerance. Setting wrong values here will collapse the connection. Keep default!
  • Maximum number of pings for average
    Sets the number of pings needed to calculate the average response time.


  • Remove UPnP port forwardings on exit
    If you enabled UPnP, eMule will forward or open the necessary ports on start up in order to be reachable for other users. By default it will try to remove those forwardings (close those ports) once you close eMule, because they are no longer needed. If you do not want eMule to remove those forwardings for some reason, you can disable this behaviour by unchecking this option.

Sharing eMule with other computer users
This option allows you to change how eMule should behave on a multi-user system. The main difference is that either all users have the same downloads and settings or each user has its own.

It is important to notice that if you change this setting, eMule will use another directory for its configuration files, which will result in a "loss" of all settings. This means you will also not see your downloads or shared files, because eMule is using different default directories. But of course you can always adjust them in the directory dialog. You can also always revert this option and all your old setting will be still there.

You need to restart eMule if you change this option to see any effect.