I'm running NX on my Fedora 8 Server. I've been able to access it for a few weeks when all of a sudden I start having an error and I can't log in anymore. When I try to run it on the actual server I get this error

nxclient: cannot connect to X server
When I try to do it from a remote computer, like at school, I get this.
NX> 203 NXSSH running with pid: 5644
NX> 285 Enabling check on switch command
NX> 285 Enabling skip of SSH config files
NX> 285 Setting the preferred NX options
NX> 200 Connected to address: ***.***.***.*** on port: 22
NX> 211 The authenticity of host '***.***.***.*** (***.***.***.***)' can't be established.
RSA key fingerprint is bb:87:a3:b6:55:29:46:67:e1:69:9f:34:a9:0b:c1:25.
Are you sure you want to continue connecting (yes/no)? 
Warning: Permanently added '***.***.***.***' (RSA) to the list of known hosts.
NX> 202 Authenticating user: nx
NX> 208 Using auth method: publickey
HELLO NXSERVER - Version 3.2.0-11 - LFE
NX> 105 Hello NXCLIENT - Version 3.2.0
NX> 134 Accepted protocol: 3.2.0
NX> 105 Set shell_mode: shell
NX> 105 Set auth_mode: password
NX> 105 Login 
NX> 101 User: Guest
NX> 102 Password: *************
NX> 103 Welcome to: shadow.server.com user: Guest
NX> 105 Listsession --user="Guest" --status="suspended\054running" --geometry="1440x900x32+render" --type="unix-kde" 
NX> 127 Available sessions: 

Display Type             Session ID                       Options  Depth Screen         Status      Session Name
------- ---------------- -------------------------------- -------- ----- -------------- ----------- ------------------------------
1023    unix-kde         0D1635552ABD6CDB0A35EB320294364F -RD--PSA    32 1280x994       Suspended   Shadow Server                 

NX> 148 Server capacity: not reached for user: Guest
NX> 105 Restoresession --link="adsl" --backingstore="1" --encryption="1" --cache="16M" --images="64M" --shmem="1" --shpix="1" --strict="0" --composite="1" --media="0" --session="Shadow\040Server" --type="unix-kde" --geometry="1440x870" --client="winnt" --keyboard="pc102\057en_US" --id="0D1635552ABD6CDB0A35EB320294364F" --resize="1" 
NX> 280 Exiting on signal: 15
My server runs in INIT 3, but this hasn't given me much trouble over the past few weeks. Any idea what could be wrong?