Server Admin refuses to connect, servermgrd runs but no ports are open

Server Admin refuses to connect to server when run locally or remotely. Upon investigating, servermgrd seems to run but when I run network utilities and port scan the server, neither port 311 or 687 are open. All other services appear to be running fine. No firewall is running. Server Monitor also has the same problems but WorkGroup Manager seems to work fine.
About 3 weeks ago, I had the problem and after trying many things, I did a clean install but the problem has reappeared after a few days/weeks.
At some point, servermgrd was crashing with a message about NSURL.... (lost and forgot the exact message).
-Tried to remove all the files in /private/var/servermgrd/
This solved the crashes but it now runs without opening the ports. After starting, it doesn't run away and consume any CPU.
Could not locate in system.log, console.log and servermgr.log any error messages indicatind something is wrong with servermgrd.
The log does show that server names are coherent.
Apr 18 23:06:31 server-1 servermgrd: servermgr_dns: hostname and DNS entries for this server are synchronized
- Tried rebooting.
- Tried running servermgrd with various flags, including alternate port but nothing happen. In fact the alternate ports do noot seem to get open. Even passing faulty options, it runs without complaining !
- Tried to reinstall the admin tools
- Tried to remove keychain paswords entries
- Tried Disk Utilities repair permissions.
Searching the posts, found somebody talkingabout servermgr_ctl
I'm starting to suspect some hardware failure (RAM).
Any suggestion how to test the ram.
Running out of idea.
Desperate for solution.
Background
OS X Server 10.4.9
Server Admin version Version 10.4.7 (157.8)
Xserve Dual G4 with 2 GB ram.   Mac OS X (10.4.9)  

Ok, I ran memtest 4.2 and discovered the ram was failing, In replacing the dimm, they started working again so it may have been a mis-seated dimm module or some oxidation on the contact. My file system was already corrupt despite it being a fresh install. Then I checked and notice that the file com.apple.servermgrd.plist in Library preferences was gone. Either I stuppidly deleted it trying to fix the problem or it was hosed by the memory/file system corruption. Anyway, I copied it from another server and Both Server Admin and Server Monitor are now working.
SOLVED.
PS: in view of this event, once I'm satisfied the memory issues is solved, I'll do again a clean install. Who know what else was corrupted.

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