Thanks for the reply.
RESTART - The very first time I applied the update 4 the server restarted by itself ok. Only it obvuisly didn't successfully apply the update as it was still showing update 2. It was then I noticed there was a message "Status : connection Failed. Please check your internet connection". When I did eventually apply the update 4 successfully, then server was on but no disk activity, then I pull the power cable.
PING - I can ping other IP addresses (outside the local network) from a putty session and www addresses. I just can't seem to ping update.synology.com from any device on my local network. I spoke to a friend who said he could ping it (just)
DSM - I don't have quick connect/easy Internet configured.
Via putty I've entered "tail /var/log/messages" and got the following (if it's of any help)
Aug 29 18:48:01 HPDiskStation ipsec__plutorun: adjusting ipsec.d to /etc/ipsec.d
Aug 29 18:48:01 HPDiskStation ipsec__plutorun: bind() will be filtered for 192.168.0.254
Aug 29 18:48:01 HPDiskStation ipsec__plutorun: 002 added connection description "L2TP-PSK-NAT"
Aug 29 18:48:01 HPDiskStation ipsec__plutorun: 002 added connection description "L2TP-PSK-noNAT"
Aug 29 18:48:04 HPDiskStation transmission-daemon[19591]: UDP Failed to set receive buffer: requested 4194304, got 262142 (tr-udp.c:78)
Aug 29 18:48:04 HPDiskStation transmission-daemon[19591]: UDP Failed to set send buffer: requested 1048576, got 262142 (tr-udp.c:89)
Aug 29 18:48:10 HPDiskStation ntpdate: Sync with time server 109.123.121.128 offset 0.271587 sec.
Aug 29 18:48:20 HPDiskStation entry.cgi_SYNO.Core.Upgrade.Server[1].check[20133]: rssfile.cpp:53 Fail to exec command [/usr/syno/bin/wget --user-agent='synology_bromolow_3612xs DSM5.0 4493 (autoupgrade)' -O /var/run/autoupdate_tmp_file_RSS http://update.synology.com/autoupdate/g ... ?tz=Dublin 2> /dev/null]. [0x0D00 string_sep_pair.c:54]
Aug 29 18:48:20 HPDiskStation entry.cgi_SYNO.Core.Upgrade.Server[1].check[20133]: dsmupdate.cpp:201 Fail to get RSS file
Aug 29 18:48:20 HPDiskStation entry.cgi_SYNO.Core.Upgrade.Server[1].check[20133]: dsmupdate.cpp:351 Fail to get latest DSM info