Greetings,
Don't know if this is the appropriate category for this, but...
For the last week month or so I've been having this issue. Sometimes this happens as soon as I log in, other times chat functions normally for a few minutes and then disconnects and has the little dot spinning in a circle in the top left corner. This sometimes resolves itself after a few minutes and chat functions normally again, other times it persists throughout my session and chat is unusable. Below is an image of the error message that pops up:
In this case chat was working for a few minutes, long enough for our alliance message to pop up, then it disconnected.
Not sure if this is an issue other people have too or just my internet connection being weird, I searched the forums before making this post and saw 3 posts/comments about the same error code (listed below):
https://forums.warframe.com/topic/1330126-error-10054-en-el-chat/#comment-12660169
https://forums.warframe.com/topic/1334473-bug-fixes-improvements-i-would-actually-care-about/#comment-12685648
https://forums.warframe.com/topic/1330525-shard-bane-ephemera-shuffles-shard-positions-around/#comment-12662664