View source for Sync Bug

=Overview=

This page is intended to explain the so-called "sync bug" that many players are experiencing for the first time following the issue 12 release. (note: this bug is actually much older, and tends to occur whenever the server populations are high)

As of the [[Patch Notes/2008-06-24|2008-06-24]] game patch, this bug can be temporarily addressed using the {{slashcommand|sync}} or {{slashcommand|synch}} slash command.

= Description =

The Sync Bug usually occurs when the player is experiencing high latency.  (Latency can be monitored using the {{slashcommand|netgraph}} command.)

At some critical point during [[client]]/[[server]] communications, an error occurs that causes the player's client to cease being synchronized with the server.  This results in the player being unable to move or target powers, because his client isn't relaying commands to the server correctly.  Additionally, he can't see or interact with any other game character who is out of range of his real position (including objects like doors and the edges of the zone).  Note that teammates can be still be seen regardless.

The really strange thing that occurs during a sync bug is that the player still appears to retain control of his character and can move around in an "abandoned" zone, from his point of view.  Other players see him standing still, but the player sees himself apparently able to move around normally.  However, he can't see or interact with anything that isn't near his real position.  

This is apparently caused by the communication error between the client and server, with the client attempting to extrapolate what the player should be seeing in response to his movements, but without updating the server on the player's actions or receiving updates from the server on the position of everything else relative to the player.  (Something similar probably happens during [[rubberbanding]].)

Luckily, chat channels still function normally.

= Solutions =

Any power or command which forces the player's position to change outside of normal movement (normal movement including running, jumping, flying) should correct the bug, although it will not eliminate the cause of the bug.

The preferred method of attempting to correct the bug is using the {{slashcommand|sync}} slash command. It attempts to force the client and server to resync immediately. However, it may still not address the cause of the sync bug.

Teleportation powers should correct a player's position instantly, and force the client and server to correct their synchronization. Due to targetting issues the player is having, [[Teleportation#Teleport|Teleport]] and [[Teleportation#Team Teleport|Team Teleport]] may not work, but [[Teleportation#Recall Friend|Recall Friend]] and [[Teleportation#Teleport Foe|Teleport Foe]] should correct the issue. [[Assemble the Team]] and [[Summon Teammates]] should also work. Other powers imitating these teleportation abilities (such as those belonging to [[Warshade]]s) are equivalent).

Self-transportation powers (that don't require a target) should also instantly correct a player's position, however a player who is susceptible to the sync bug may experience it again in the new zone. The [[Inherent Powers#Pocket D VIP Pass|Pocket D VIP Pass]], the [[Consignment House Transporter]], the [[Black Market Transporter]], and the [[Veteran Reward Powers#Base Transporter|Base Transporter]] should do the trick.

Additionally, a player can use an [[Ouroboros Portal]] to leave, although he may have trouble using his own. A teammate's should work fine, if the player who is desynced is near his actual location.

Finally, if all of the above options fail, a player can log out of the game and back in (restarting the game should not be necessary).

= Further Reading =

Lighthouse has asked players suffering from this bug to report, as can be read here [http://boards.cityofheroes.com/showflat.php?Number=10842146].

[[Category:Bugs]]
[[Category:Definition]]