(Reuters) – Security software maker Palo Alto Networkss quarterly revenue jumped 49 percent as subscriptions rose, sending its shares up 8 percent in extended trading. The companys net loss increased to $7.9 million, or 11 cents per share, in the first quarter ended October 31, from $3.5 million, or 5 cents per share, a year earlier. Excluding items, the company earned 8 cents per share Revenue rose to $128.2 million from $85.9 million. Palo Alto Networks sells firewalls that prevent data breaches and block malware and viruses. …