Category Archives: Local IT systems

Sys-admin news

CentOS5 (Linux server) network service problems.

A Redhat package problem caused CentOS 5 machines (Linux Servers) to loose access to certain network services. One of our two mail servers may have rejected email between 04:15 and 04:30, when the problem was spotted and the failing MTA … Continue reading

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DNS resolvers now validating

The CL DNS resolvers have DNSSEC validation enabled. Please report any DNS problems to sys-admin.

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Remote backups resumed

The regular remote backups that were suspended on 30th January have now resumed. In particular home directories are now up to date on the remote server and should continue to be backed up hourly. Some snapshots with non-standard names will … Continue reading

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IPv6 address changes

There has recently been a change to the IPv6 address allocations used in the University, though at present this affects relatively few people. The reason for the change is that the original allocation to Cambridge was not thought to be … Continue reading

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Problem with remote backups

Since the morning of Monday 30th January, we have had a problem with the offsite backup system; a number of filesystems, including the one containing user home directories, are not being copied to the offsite server. The problem began when … Continue reading

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Network problem 2011-11-25

There was a major problem with the CL internal network during the afternoon of Friday 25th November, believed to have been caused by a faulty switch. There were a number of consequential side effects on other systems, which we now … Continue reading

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Unix group cleanup

On departmental Linux systems, many Unix groups have been added locally, to facilitate groups of users jointly editing files. Use the shell command “id” to see which groups you are a member of. To avoid malfunctions, we now need to … Continue reading

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CentOS 5.7 released – kernel lock bug fixed

Although not yet announced on the CentOS web site, CentOS 5.7 has been released, which includes a new kernel which fixes the bug which caused the machine to OOPS if an NFS file lock was attempted. As such, there will … Continue reading

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Wireless network replacement – phase 2 complete

Phase 2 of the wireless network replacement is now complete, adding a number of mid-corridor access points. No further expansion is currently planned. Filling in any remaining dead spots should be technically straightforward, but will incur an additional cost.

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Phone outage Thursday 28th July

The Computing Service send their apologies for the telephone system outage this morning. A small and fairly routine reconfiguration was made to the West Cambridge routers during this morning’s CUDN vulnerable period, ironically with the ultimate goal of improving network … Continue reading

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