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Category Archives: Local IT systems
Network outages and consequences
As of about the 11th of March, we have been having a number of problems with servers crashing, machines misbehaving, network dropouts, things going slowly, etc. We believe this to be due to some sort of local networking problem with the … Continue reading
Unix groups now also available in AD
All Unix groups are now also maintained as a set of Security Groups in the Active Directory. The membership is controlled from the Unix groups and additions and deletions to maintain the groups in synchronisation are performed hourly during the … Continue reading
slogin-serv move to NFS sec=krb5
Any users of the “slogin-serv” service should be aware that changes are to be made which may require them to run “kinit” to access their home directory.
Web server changes
Two small changes have been made to the Lab web server that may break some existing web pages, in particular those using other character encodings than UTF-8. The first is intended to improve rendering of Lab pages in Internet Explorer … Continue reading
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Network flood
A traffic flood from a research group machine caused some network performance problems between sometime in the small hours of Thursday 2nd December and about 09:40 when the source was identified and disconnected. Our use of VLANs to separate traffic … Continue reading
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“wgb” wireless network
The “wgb” wireless network is running very slowly at the moment and is congested. The reason for this is that the ADSL connectivity that lies behind it has been capped at 128kbit/s because of excessive usage under Demon’s fair usage … Continue reading
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Network switch failure
A network switch providing connections in the north east corner of the first floor failed shortly after 04:00 this morning (2010-10-21). It is one of two switches in the wiring closet so some machines and telephones in the area would … Continue reading
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Mail server replacement
The last exim3 MTA (whittlesey) is about to be replaced by an exim4 one (sutton). This should not cause any disruption, but please email sys-admin if you suspect any problems.
slogin-serv* hosts IP addresses changing
The IP addresses associated with the slogin-serv* servers is changing as they are moving to a subnet for machines using NFS sec=sys. This may cause ssh to warn that that the IP address differs, but that the host key matches. … Continue reading
WGB power outages
The WGB lost power on Wed 11th Aug 2010 and three times on Sat 14th due to the main 240v breaker in GN17 tripping, probably caused by a problem with the temperature sensor, from reports of other sites. It is … Continue reading
Posted in Local IT systems
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